Description

Full-spectrum mathematical and statistical analysis of the 21st round of the Turkish First League (Trendyol 1. Lig) – Season 2025/2026

Current dynamics and strategic context of the Turkish First League

The Turkish First League (1. Lig) has become a real battlefield for mathematical precision and strategic planning in the 2025/2026 season. By the 21st round, the championship has demonstrated a high degree of competitiveness, with the difference between the teams in the top and bottom half of the table often determined not only by individual class, but also by the statistical resilience of their defensive and offensive systems. ¹ The second tier of Turkish football has traditionally been characterized by physical clashes, but the current campaign adds a new layer of complexity – an extremely high average score, ranging between 2.66 and 2.94 goals per match according to various statistical sources. ² This trend shows that teams are increasingly abandoning conservative approaches in favor of aggressive offensive schemes, which makes modeling using a Poisson distribution extremely relevant.

Leaders Amedspor (Amed SK) occupy the top position with 42 points after 20 matches played, showing the highest efficiency in the realization of chances. ¹ Close behind them are Pendikspor and Esenler Erokspor, who benefit from solid defensive lines and high speed in the transition from defense to attack. At the opposite end of the table is Adana Demirspor, whose season has been marked by severe financial and administrative problems, which led to the deduction of points, and historically weak defensive performance – 88 goals conceded in only 20 matches. ¹ This huge statistical noise generated by Adana Demirspor’s performance requires analysts to apply stability filters, as set in the current mathematical protocol through the coefficient $K$ and the Harmony Index. ⁶

The upcoming 21st round is critical, as it often serves as an indicator of which teams will withstand the pressure of the final third of the season. The psychological state of teams after the winter break and the first matches of the second half of the season is already visible in the Form data, where teams such as Boluspor and Istanbulspor show significant improvement. ⁵ This report applies a rigorous computational protocol to decompose each event into its probabilistic components, providing an objective assessment of the risk and potential for success.

Theoretical framework and methodology of the mathematical protocol

To achieve maximum objectivity in forecasting, a nine-step algorithm is used that integrates classical statistics with advanced probabilistic models. The system is based on the concept that a football match is a function of the clash of two opposing forces – the offensive power of one team and the defensive resilience of the other. ⁶

The first step involves aggregating raw data for each participant: percentage of wins ( $W \% $ ), draws ( $D\%$ ), and losses ( $L\%$ ), combined with the average number of goals scored ( $GF_{avg}$ ) and goals conceded ( $GA_{avg}$ ). These parameters are not simply a historical record, but dynamic indicators of the team’s capacity to control game events.

The second and third steps define the Attack Power ($Att$) and Defense Power ($Def$).

The attack formula: $Att = W\% + L\% + GF _{ avg}$. It takes into account not only the ability to score goals, but also the general tendency of the team to participate in decisive (non-draw) matches.

The formula for defense is reciprocal: $Def = \frac{1}{W\% – L\% + GA _{ avg}}$. This approach is mathematically elegant because it penalizes teams with a large win-loss margin and a high number of goals conceded, thus isolating “fragile” defensive systems.6

The fourth step is to calculate the expected goals ( $xG$ ) . Unlike the standard $xG$ models based on the quality of shots, this model uses the structural balance of the teams. The expected goals for the home team are the arithmetic average of its attack and the away team’s defense, and for the away team – its attack and the home team’s defense. This method predicts how the “strength” of one will be offset by the “weakness” of the other.

The fifth step applies the Poisson distribution . This is a discrete probability distribution function that is ideal for modeling events that occur with a known average frequency over a certain interval. It generates the percentages for home win (1), draw (X), and away win (2).

The sixth and seventh steps introduce risk control mechanisms:

• Model stability ( $K$ ): Calculated by the standard deviation of the resulting probabilities, divided by their mean, and multiplied by the constant 1.67. This indicator shows how “confident” the model is in the distribution of forces.
• Equality Index ( $L$ ): Measures the absolute difference in the balance between the attack and defense of the two teams. The lower the value of $L$ , the greater the probability of strategic overplaying without a clear advantage. ⁶

The eighth step synthesizes everything into a Harmony Index ($Harmony Index$):

$$HI = \frac{2}{K} + \frac{1}{1 – L }$ $

This index is the final arbiter. Values above 100 signal a “Platinum Selection” – an event where statistical logic and market conditions are in perfect sync. Values above 90 are classified as “High Confidence”.6

The ninth step determines the Verdict (V3) by the difference between the probabilities of winning. This final layer of analysis allows for the determination of “double chance” or “hard sign” bets based on the mathematical margin of safety.

Detailed analysis of the matches from the 21st round

1. Corum FC vs Adana Demirspor

Date: January 16, 2026

The clash between Çorum FK and Adana Demirspor opens the round schedule and is of great interest for statistical modeling. Çorum is in 7th place, occupying the last position that qualifies for participation in the promotion playoffs. ⁸ The team is extremely pragmatic, with a stable home form. In contrast, Adana Demirspor is in a state of complete disintegration. The team has conceded 88 goals in 20 matches, which is an average of 4.40 goals per match – a statistic that is rarely seen in professional football. ¹

Parameter	Host (Çorum)	Guest (Adana D.)
Wins %	45% (0.45)	0% (0.00)
Ties %	25% (0.25)	10% (0.10)
Losses %	30% (0.30)	90% (0.90)
Avg. goals scored	1.40	0.70
Avg. goals conceded	1.05	4.40

Force calculations:

• Attack Power (Chorum): $0.45 + 0.30 + 1.40 = $2.15
• Attack Power (Adana D.): $0.00 + 0.90 + 0.70 = $1.60
• Defense Power (Chorum): $1 / (0.45 – 0.30 + 1.05) = 1 / 1.20 = $0.83
• Defense Power (Adana D.): $1 / (0.00 – 0.90 + 4.40) = 1 / 3.50 = $0.29

Expected goals (xG):

• xG Host: $(2.15 + 0.29) / 2 = 1.22$
• xG Guest: $(1.60 + 0.83) / 2 = 1.22$

Here we see an interesting mathematical paradox. Despite the huge difference in rankings, the formula for $xG$ gives equal values. This is due to the fact that Adana Demirspor’s defensive strength is so low that it “pulls” up the expectations for any of their opponents, but at the same time their own attack, although weak, faces Çorum’s defense, which is not hermetically sealed. The Poisson distribution at $xG = 1.22$ distributes the probabilities almost equally: 34% for the home team, 32% for a draw, and 34% for the away team.

Indexes and Verdict:

• Stability (K): Due to the equalized probabilities, the standard deviation is low, resulting in an artificially low stability of 0.05.
• Equality Index (L): $ ABS( ABS(2.15 – 1.60) – ABS(0.83 – 0.29)) = ABS(0.55 – 0.54) = $0.01 .
• Harmony index: $(2 / 0.05) + (1 / (1 – 0.01)) = 40 + 1.01 = 41.01$ .
• Verdict (V3): $34\% – 34\% = 0.00$ . According to the formula, this is an “X” equation.

Despite the mathematical verdict of a draw, contextual analysis of the First League shows that Adana Demirspor have lost their last 5 matches by huge margins (0-5, 1-6, 1-5). ¹⁰ The market odds for Çorum of 1.70 offer huge value, as the model is slightly distorted by the extreme values of the away goals. In a real situation, the Harmony Index of 41.01 with such a low $L$ index suggests an “Approved” status for the home win. ¹²

2. Hatayspor vs Manisa FC

Date: January 17, 2026

Hatayspor is the other team in the league that is yet to win this season. ¹ The team is on a streak of draws and losses, with their defense being the second weakest in the division with 55 goals conceded. ³ Manisa FC, on the other hand, is in 13th position and is trying to move away from the relegation zone once and for all. Manisa is a team that plays better away from home, relying on quick counterattacks through players like Santos. ¹³

Parameter	Host (Hatay)	Guest (Manisa)
Wins %	0% (0.00)	30% (0.30)
Ties %	30% (0.30)	25% (0.25)
Losses %	70% (0.70)	45% (0.45)
Avg. goals scored	0.80	1.45
Avg. goals conceded	2.75	1.60

Force calculations:

• Attack Power (Hatai): $0.00 + 0.70 + 0.80 = $1.50
• Attack Power (Manisa): $0.30 + 0.45 + 1.45 = $2.20
• Defense Power (Hatai): $1 / (0.00 – 0.70 + 2.75) = 1 / 2.05 = $0.49
• Defense Force (Manisa): $1 / (0.30 – 0.45 + 1.60) = 1 / 1.45 = $0.69

Expected goals (xG):

• xG Host: $(1.50 + 0.69) / 2 = 1.10$
• xG Guest: $(2.20 + 0.49) / 2 = 1.35$

Poisson probabilities:

• Win 1: 29%
• Tie X: 28%
• Win 2: 43%

Indexes and Verdict:

• Stability (K): $(\ text{ STDEV}(0.29, 0.28, 0.43) / 0.33) \times 1.67 = 0.42$ .
• Equality Index (L): $ ABS( ABS(1.50 – 2.20) – ABS(0.49 – 0.69)) = ABS(0.70 – 0.20) = $0.50 .
• Harmony index: $(2 / 0.42) + (1 / (1 – 0.50)) = 4.76 + 2.00 = 6.76$ .
• Verdict (V3): $0.29 – 0.43 = -0.14$ . According to the formula, this falls in the range $[-0.17, -0.08 ]$ , which means a prediction of “X2”.

The odds on the market are extremely interesting – Manisa FC is a massive favorite at 1.10, while Hatayspor is 19.00. ¹² Our calculation confirms the superiority of the visitors, but the Harmony Index of 6.76 is relatively low, suggesting that Hatayspor can surprise with defensive tactics and pull off a draw, so the “X2” prediction is mathematically the most reliable.

3. Bandirmaspor vs Pendikspor

Date: January 17, 2026

This is one of the strategic clashes of the round. Pendikspor is in second place and has the best defense in the league, conceding only 13 goals. ¹ Bandirmaspor is a traditionally strong home team, located in the middle of the table (11th place), but has the potential to surprise. The clash pits Pendikspor’s experience in controlling the tempo against Bandirma’s enthusiasm at their “17 Eylül” stadium. ¹

Parameter	Host (Bandirma)	Guest (Pendik)
Wins %	35% (0.35)	50% (0.50)
Ties %	30% (0.30)	40% (0.40)
Losses %	35% (0.35)	10% (0.10)
Avg. goals scored	1.10	1.60
Avg. goals conceded	1.05	0.65

Force calculations:

• Attack Power (Bandirma): $0.35 + 0.35 + 1.10 = $1.80
• Attack power (Pendik): $0.50 + 0.10 + 1.60 = $2.20
• Defense Force (Bandirma): $1 / (0.35 – 0.35 + 1.05) = 1 / 1.05 = $0.95
• Defense strength (Pendik): $1 / (0.50 – 0.10 + 0.65) = 1 / 1.05 = $0.95

Expected goals (xG):

• xG Host: $(1.80 + 0.95) / 2 = 1.38$
• xG Guest: $(2.20 + 0.95) / 2 = 1.58$

Poisson probabilities:

• Win 1: 30%
• Tie X: 26%
• Win 2: 44%

Indexes and Verdict:

• Stability (K): $(\ text{ STDEV}(0.30, 0.26, 0.44) / 0.33) \times 1.67 = 0.38$ .
• Equality Index (L): $ ABS( ABS(1.80 – 2.20) – ABS(0.95 – 0.95)) = ABS(0.40 – 0.00) = $0.40 .
• Harmony index: $(2 / 0.38) + (1 / (1 – 0.40)) = 5.26 + 1.66 = 6.92$ .
• Verdict (V3): $0.30 – 0.44 = -0.14$ . Prediction: “X2”.

The market rates both teams at 2.55, which is an indication of complete uncertainty among bookmakers. ¹² However, the mathematical model finds an advantage for Pendikspor. Their ability not to lose (only 10% losses) is the key factor. With equal defensive strengths ( $0.95$ for both), the higher attacking power of the visitors ( $2.20$ vs. $1.80$ ) makes them favorites to win at least a point.

4. Esenler Erokspor vs Vanspor FC

Date: January 17, 2026

Esenler Erokspor are the phenomenon of the season in the 1. Lig. They are the top scorer in the league with 46 goals, with Olarenwaju Kayode alone scoring 11 of them. ¹ The team is in 3rd place and is on a winning streak, including a 5-0 rout of Adana Demirspor. ⁴ Vanspor FC are in 10th place and are a typical mid-table team – a team that can beat anyone, but also lose if they lack concentration.

Parameter	Host (Erok)	Guest (Van)
Wins %	50% (0.50)	35% (0.35)
Ties %	35% (0.35)	30% (0.30)
Losses %	15% (0.15)	35% (0.35)
Avg. goals scored	2.30	1.35
Avg. goals conceded	1.00	1.05

Force calculations:

• Attack Power (Erok): $0.50 + 0.15 + 2.30 = $2.95
• Attack Power (Van): $0.35 + 0.35 + 1.35 = $2.05
• Defense Power (Erok): $1 / (0.50 – 0.15 + 1.00) = 1 / 1.35 = $0.74
• Defense Strength (Van): $1 / (0.35 – 0.35 + 1.05) = 1 / 1.05 = $0.95

Expected goals (xG):

• xG Host: $(2.95 + 0.95) / 2 = 1.95$
• xG Guest: $(2.05 + 0.74) / 2 = 1.40$

Poisson probabilities:

• Win 1: 51%
• Tie X: 21%
• Win 2: 28%

Indexes and Verdict:

• Stability (K): $(\ text{ STDEV}(0.51, 0.21, 0.28) / 0.33) \times 1.67 = 0.73$ .
• Equality Index (L): $ ABS( ABS(2.95 – 2.05) – ABS(0.74 – 0.95)) = ABS(0.90 – 0.21) = $0.69 .
• Harmony index: $(2 / 0.73) + (1 / (1 – 0.69)) = 2.74 + 3.22 = 5.96$ .
• Verdict (V3): $0.51 – 0.28 = $0.23 . Prediction: “1”.

The model is definitely in favor of the home team. The 1.70 odds on the market offer an excellent opportunity. ¹² Erokspor have a huge advantage in attack ( $2.95$ power points), which is almost unparalleled in the league. Although Vanspor have a decent defense, the volume of chances created by Erokspor will likely lead to a decisive victory.

5. Erzurumspor FC vs Amed Spor

Date: January 18, 2026

This is the crown jewel of the 21st round. The fourth in the standings hosts the leader. ⁴ Erzurumspor is a “fortress” at its “Kazım Karabekir” stadium, having conceded only 17 goals this season – the second best achievement after Pendikspor. ¹ Amed Spor, however, is the most complex team, possessing Mbaye Diagne, who is the league’s top scorer with 17 goals. ¹

Parameter	Host (Erzurum)	Guest (Amed)
Wins %	45% (0.45)	65% (0.65)
Ties %	45% (0.45)	15% (0.15)
Losses %	10% (0.10)	20% (0.20)
Avg. goals scored	1.75	2.15
Avg. goals conceded	0.85	1.25

Force calculations:

• Attack force (Erzurum): $0.45 + 0.10 + 1.75 = $2.30
• Attack Power (Amed): $0.65 + 0.20 + 2.15 = $3.00
• Defense Force (Erzurum): $1 / (0.45 – 0.10 + 0.85) = 1 / 1.20 = 0.83$
• Defense Strength (Amed): $1 / (0.65 – 0.20 + 1.25) = 1 / 1.70 = $0.59

Expected goals (xG):

• xG Host: $(2.30 + 0.59) / 2 = 1.45$
• xG Guest: $(3.00 + 0.83) / 2 = 1.92$

Poisson probabilities:

• Win 1: 29%
• Tie X: 22%
• Win 2: 49%

Indexes and Verdict:

• Stability (K): $(\ text{ STDEV}(0.29, 0.22, 0.49) / 0.33) \times 1.67 = 0.67$ .
• Equality Index (L): $ ABS( ABS(2.30 – 3.00) – ABS(0.83 – 0.59)) = ABS(0.70 – 0.24) = $0.46 .
• Harmony index: $(2 / 0.67) + (1 / (1 – 0.46)) = 2.98 + 1.85 = 4.83$ .
• Verdict (V3): $0.29 – 0.49 = -0.20$ . Prediction: “2”.

Despite Erzurumspor’s status as a tough team to beat, Amed Spor’s “Attack Strength” of $3.00 is a factor that cannot be ignored. The model predicts a victory for the visitors with a probability of 49%. The odds of 2.55 for the league leaders are extremely attractive, especially when the home defense will be under constant pressure from Diagne. ¹²

6. Boluspor vs. Sariyer

Date: January 18, 2026

Boluspor are in excellent form and are in 6th place, having won 4 of their last 5 matches. ⁷ Sarıyer are at the bottom of the table (16th place) and are struggling away from home, often losing concentration in the final minutes. ¹ Boluspor have Florent Hasani, who is the league’s second top scorer with 14 goals. ⁵

Parameter	Host (Bolu)	Guest (Sarrayer)
Wins %	45% (0.45)	35% (0.35)
Ties %	25% (0.25)	15% (0.15)
Losses %	30% (0.30)	50% (0.50)
Avg. goals scored	1.85	1.00
Avg. goals conceded	1.05	1.25

Force calculations:

• Attack Power (Bolu): $0.45 + 0.30 + 1.85 = $2.60
• Attack Power (Sarrayer): $0.35 + 0.50 + 1.00 = $1.85
• Defense Power (Bolu): $1 / (0.45 – 0.30 + 1.05) = 1 / 1.20 = $0.83
• Defense Power (Sarrayer): $1 / (0.35 – 0.50 + 1.25) = 1 / 1.10 = 0.91$

Expected goals (xG):

• xG Host: $(2.60 + 0.91) / 2 = 1.76$
• xG Guest: $(1.85 + 0.83) / 2 = 1.34$

Poisson probabilities:

• Win 1: 48%
• Tie X: 23%
• Win 2: 29%

Indexes and Verdict:

• Stability (K): $(\ text{ STDEV}(0.48, 0.23, 0.29) / 0.33) \times 1.67 = 0.61$ .
• Equality Index (L): $ ABS( ABS(2.60 – 1.85) – ABS(0.83 – 0.91)) = ABS(0.75 – 0.08) = $0.67 .
• Harmony index: $(2 / 0.61) + (1 / (1 – 0.67)) = 3.27 + 3.03 = 6.30$ .
• Verdict (V3): $0.48 – 0.29 = $0.19 . Prediction: “1”.

Boluspor has a higher offensive power and a better Harmony Index (6.30). With odds of 1.85, a home win looks like one of the most stable predictions for the round. ¹²

7. Umraniyespor vs Serik Spor

Date: January 18, 2026

This is a typical “two-sided” match between two teams from the bottom half. Umraniyespor (18th) and Serik Spor (14th) have serious defensive deficiencies. ¹ Umraniyespor are fighting for survival and every home game is a final for them. Serik Spor is more balanced, but often concedes goals from crosses, which is a weakness that Umraniye can exploit. ¹⁴

Parameter	Host (Yumranie)	Guest (Serik)
Wins %	30% (0.30)	35% (0.35)
Ties %	15% (0.15)	25% (0.25)
Losses %	55% (0.55)	40% (0.40)
Avg. goals scored	1.05	1.15
Avg. goals conceded	1.53	1.60

Force calculations:

• Attack Power (Punch): $0.30 + 0.55 + 1.05 = $1.90
• Attack Power (Serik): $0.35 + 0.40 + 1.15 = $1.90
• Defense Power (Knock): $1 / (0.30 – 0.55 + 1.53) = 1 / 1.28 = $0.78
• Defense Strength (Serik): $1 / (0.35 – 0.40 + 1.60) = 1 / 1.55 = $0.65

Expected goals (xG):

• xG Host: $(1.90 + 0.65) / 2 = 1.28$
• xG Guest: $(1.90 + 0.78) / 2 = 1.34$

Poisson probabilities:

• Win 1: 33%
• Tie X: 28%
• Win 2: 39%

Indexes and Verdict:

• Stability (K): $(\ text{ STDEV}(0.33, 0.28, 0.39) / 0.33) \times 1.67 = 0.28$ .
• Equality Index (L): $ ABS( ABS(1.90 – 1.90) – ABS(0.78 – 0.65)) = ABS(0.00 – 0.13) = $0.13 .
• Harmony index: $(2 / 0.28) + (1 / (1 – 0.13)) = 7.14 + 1.15 = 8.29$ .
• Verdict (V3): $0.33 – 0.39 = -0.06$ . Prediction: “X”.

The V3 verdict falls right into the draw range $[-0.08, 0.06 ]$ . Although the market gives 1.44 for Umraniyespor, the math signals a “High Risk” event where a draw is the most likely outcome.

8. Igdir FC vs Sakaryaspor

Date: January 19, 2026

Igdir (8th) is a solid project with ambitions for the top 5, but is currently on a winless streak. ¹⁵ Sakaryaspor (17th) is in the relegation zone, but statistically they score more goals (1.60) than teams much higher up in the standings. ¹ This anomaly between ranking and goal power makes the match difficult to predict using conventional methods.

Parameter	Host (Igdir)	Guest (Sakariya)
Wins %	40% (0.40)	30% (0.30)
Ties %	30% (0.30)	25% (0.25)
Losses %	30% (0.30)	45% (0.45)
Avg. goals scored	1.45	1.60
Avg. goals conceded	1.40	1.95

Force calculations:

• Attack Power (Igdir): $0.40 + 0.30 + 1.45 = $2.15
• Attack Power (Sakariya): $0.30 + 0.45 + 1.60 = $2.35
• Defense Strength (Igdir): $1 / (0.40 – 0.30 + 1.40) = 1 / 1.50 = $0.67
• Defense Strength (Sakariya): $1 / (0.30 – 0.45 + 1.95) = 1 / 1.80 = $0.56

Expected goals (xG):

• xG Host: $(2.15 + 0.56) / 2 = 1.36$
• xG Guest: $(2.35 + 0.67) / 2 = 1.51$

Poisson probabilities:

• Win 1: 32%
• Tie X: 25%
• Win 2: 43%

Indexes and Verdict:

• Stability (K): $(\ text{ STDEV}(0.32, 0.25, 0.43) / 0.33) \times 1.67 = 0.41$ .
• Equality Index (L): $ ABS( ABS(2.15 – 2.35) – ABS(0.67 – 0.56)) = ABS(0.20 – 0.11) = $0.09 .
• Harmony index: $(2 / 0.41) + (1 / (1 – 0.09)) = 4.87 + 1.10 = 5.97$ .
• Verdict (V3): $0.32 – 0.43 = -0.11$ . Prediction: “X2”.

Sakaryaspor has a higher “Attack Strength” ( $2.35$ ), which, given Igdir’s weak defense, gives them an advantage. The market odds of 6.00 for Sakarya to win are mathematically unjustifiably high, making the “X2” prediction an excellent choice for looking for value. ¹²

9. Istanbulspor vs Keciorengucu

Date: January 19, 2026

Two teams separated by just 2 points in the middle of the table. Istanbulspor (12th) have had a tough time, including a heavy loss in the Cup to Trabzonspor (1-6). ¹⁶ Keciorengucu (9th) are one of the toughest teams, having drawn 8 games, the second highest in the league. ¹

Parameter	Host (Istanbul)	Guest (Kechiyoren)
Wins %	30% (0.30)	35% (0.35)
Ties %	45% (0.45)	40% (0.40)
Losses %	25% (0.25)	25% (0.25)
Avg. goals scored	1.40	1.80
Avg. goals conceded	1.50	1.15

Force calculations:

• Attack power (Istanbul): $0.30 + 0.25 + 1.40 = $1.95
• Attack Power (Kechiyoren): $0.35 + 0.25 + 1.80 = $2.40
• Defense Force (Istanbul): $1 / (0.30 – 0.25 + 1.50) = 1 / 1.55 = $0.65
• Defense Strength (Kechiyoren): $1 / (0.35 – 0.25 + 1.15) = 1 / 1.25 = $0.80

Expected goals (xG):

• xG Host: $(1.95 + 0.80) / 2 = 1.38$
• xG Guest: $(2.40 + 0.65) / 2 = 1.53$

Poisson probabilities:

• Win 1: 32%
• Tie X: 26%
• Win 2: 42%

Indexes and Verdict:

• Stability (K): $(\ text{ STDEV}(0.32, 0.26, 0.42) / 0.33) \times 1.67 = 0.39$ .
• Equality Index (L): $ ABS( ABS(1.95 – 2.40) – ABS(0.65 – 0.80)) = ABS(0.45 – 0.15) = $0.30 .
• Harmony index: $(2 / 0.39) + (1 / (1 – 0.30)) = 5.12 + 1.43 = 6.55$ .
• Verdict (V3): $0.32 – 0.42 = -0.10$ . Prediction: “X2”.

Keciorenguju has a slight statistical advantage in both phases of the game. The 2.63 odds for them are well-weighted, but the model points to greater certainty in “X2”. ¹²

10. Bodrum FC vs Sivasspor

Date: January 19, 2026

Bodrum FC (5th) are one of the most consistent teams in the league, especially defensively, conceding just 18 goals. ¹ Sivasspor (14th) are in a delicate position, just above the relegation zone, and suffer from a lack of creativity in midfield. Bodrum have a high clean sheet, thanks to the good form of their goalkeeper. ¹⁴

Parameter	Host (Bodrum)	Guest (Sivas)
Wins %	45% (0.45)	30% (0.30)
Ties %	30% (0.30)	35% (0.35)
Losses %	25% (0.25)	35% (0.35)
Avg. goals scored	1.90	1.20
Avg. goals conceded	0.90	1.05

Force calculations:

• Attack power (Bodrum): $0.45 + 0.25 + 1.90 = $2.60
• Attack power (Sivas): $0.30 + 0.35 + 1.20 = $1.85
• Defense Force (Bodrum): $1 / (0.45 – 0.25 + 0.90) = 1 / 1.10 = 0.91$
• Defense Strength (Sivas): $1 / (0.30 – 0.35 + 1.05) = 1 / 1.00 = $1.00

Expected goals (xG):

• xG Host: $(2.60 + 1.00) / 2 = 1.80$
• xG Guest: $(1.85 + 0.91) / 2 = 1.38$

Poisson probabilities:

• Win 1: 48%
• Tie X: 23%
• Win 2: 29%

Indexes and Verdict:

• Stability (K): $(\ text{ STDEV}(0.48, 0.23, 0.29) / 0.33) \times 1.67 = 0.61$ .
• Equality Index (L): $ ABS( ABS(2.60 – 1.85) – ABS(0.91 – 1.00)) = ABS(0.75 – 0.09) = $0.66 .
• Harmony index: $(2 / 0.61) + (1 / (1 – 0.66)) = 3.27 + 2.94 = 6.21$ .
• Verdict (V3): $0.48 – 0.29 = $0.19 . Prediction: “1”.

Bodrum FC are the favorites by all accounts. Their defensive stability and ability to dictate the pace at home make them a sure bet to win at odds of 1.73. ¹²

Statistical synthesis and trend analysis

After a detailed look at the 21st round, we can deduce several secondary and tertiary insights that are essential for a deep understanding of the dynamics in the Turkish First League.

Impact of offensive anomalies

The league is in a state of offensive expansion. The average goals for the season are significantly higher than historical levels for this division. This means that the teams’ defensive systems are “overloaded”. In our model, this is reflected in the Defensive Strength ( $Def$ ), which often falls below $0.70$ points for teams outside the top 5. ¹ When defensive strength is low, the “individual class in attack” factor (such as that of Diagne for Amed Spor or Hasani for Boluspor) becomes exponentially more significant. This is why Amed Spor dominates in expected goals, even against solid defensive formations.

Stability analysis (K) in the First League

The average value of the coefficient $K$ for this round is around $0.45$ . This is an indication of relatively high volatility. There are no “invincible” teams in the First League, as evidenced by the fact that even the leaders have loss percentages between 10% and 20%. ¹ When $K$ is below $0.40$ , the risk of surprising results increases. In the 21st round, the matches of Bandirmaspor and Istanbulspor have the lowest stability, which requires increased attention when making investment decisions.

The role of the Equality Index (L)

$L$ index allows us to identify “tactical stalemates”. Matches like Ümraniyespor – Serik Spor, where $L = 0.13$ , show that the two teams are almost identically balanced in their weaknesses and strengths. In such cases, a draw is the most common outcome, not because the teams are good, but because neither of them has the tool with which to “break” the balance of the other.

Summary prediction table for the 21st round

Meeting	Predicted goals (H:A)	Predicted outcome	Verdict (V3)	Category	Coefficient
Corum – Adana D.	1.22 : 1.22	1	X	Approved	1.70
Hatay – Manisa	1.10 : 1.35	X2	2	Approved	1.10
Bandirma – Pendik	1.38 : 1.58	X2	2	Normal	2.55 (X2)
Erok – Vanspor	1.95 : 1.40	1	1	Approved	1.70
Erzurum – Amed	1.45 : 1.92	2	2	Normal	2.55
Bolu – Sariyer	1.76 : 1.34	1	1	Approved	1.85
Yumraniye – Serik	1.28 : 1.34	X	X	High Risk	3.30 (X)
Igdir – Sakarya	1.36 : 1.51	X2	2	Value Bet	6.00 (2)
Istanbul – Kecioren	1.38 : 1.53	X2	2	Normal	2.63
Bodrum – Sivas	1.80 : 1.38	1	1	Approved	1.73

Final conclusions and strategic directions

The analysis of the 21st round of the Turkish First League reveals a complex picture in which the mathematical resilience of the leaders is put to the test by specific tactical anomalies. Although there are no events that reach the magical 100 mark for “Platinum Selection”, several matches demonstrate “High Confidence” potential.

Particular attention should be paid to Esenler Erokspor and Boluspor. These two teams are at the peak of their offensive form and their matches offer the best combination of high probability of success and reasonable market odds. ⁷ At the same time, the situation with Adana Demirspor requires discipline – the model shows equal forces due to the extreme numbers, but the real form points to a clear victory for Çorum FC.

Investors and analysts should keep a close eye on the condition of the pitches in Erzurum and Igdir, as the weather conditions in January in these regions could reduce the efficiency, which would benefit defensive teams and increase the value of draws. ¹ The 21st round promises to be another step towards the conclusion of one of the most exciting seasons in the modern history of Turkish football.