Kacper Piorun vs Jakub Kosakowski
GM Kacper Piorun (2519) · GM Jakub Kosakowski (2543)
Kacper Piorun and Jakub Kosakowski have played 29 recorded games against each other, the first in Oct 2023 and the most recent in Sep 2025. Piorun leads 5 wins to 12 - trailing overall, with 12 draws (59% of the games were decisive). Their most common battleground is the Réti Opening (3 games). The average game between them lasted 43 moves.
Results by color
| Split | Games | Piorun | Draws | Kosakowski |
|---|---|---|---|---|
| Piorun with White | 14 | 3 | 4 | 7 |
| Kosakowski with White | 15 | 2 | 8 | 5 |
Results by time format
| Format | Games | Piorun | Draws | Kosakowski |
|---|---|---|---|---|
| Blitz | 25 | 5 | 8 | 12 |
| Classical | 2 | 0 | 2 | 0 |
| Rapid | 2 | 0 | 2 | 0 |
Openings in their games
| ECO | Opening | Games | Piorun | Draws | Kosakowski |
|---|---|---|---|---|---|
| A34 | Réti Opening | 3 | 0 | 1 | 2 |
| B30 | Sicilian: Rossolimo | 2 | 0 | 2 | 0 |
| C01 | French Defense | 2 | 0 | 1 | 1 |
| C16 | French: Winawer Variation | 2 | 0 | 2 | 0 |
| D38 | Queen's Gambit Declined: Ragozin Defense | 2 | 1 | 0 | 1 |
| B15 | Caro-Kann: Main Line | 2 | 0 | 1 | 1 |
| B11 | Caro-Kann: Two Knights Variation | 1 | 0 | 0 | 1 |
| A80 | Dutch Defense | 1 | 0 | 1 | 0 |
All games
| Date | White | Black | Result | Opening | Event |
|---|---|---|---|---|---|
| Sep 2025 | Jakub Kosakowski | K Piorun | 1/2-1/2 | Scotch Game | Szansa Open Rapid |
| May 2025 | K Piorun | Jakub Kosakowski | 1/2-1/2 | Dutch Defense | 82nd ch-POL |
| Jul 2024 | Jakub Kosakowski | Kacper Piorun | 0-1 | French: Tarrasch Variation | Warsaw Maciei Mem Blitz |
| May 2024 | Kacper Piorun | Jakub Kosakowski | 1/2-1/2 | English Opening: Reverse Sicilian | ch-POL 81st |
| Jan 2024 | Kacper Piorun | Jakub Kosakowski | 1-0 | Sicilian | Speed Chess Poland |
| Jan 2024 | Kacper Piorun | Jakub Kosakowski | 1/2-1/2 | Caro-Kann: Main Line | Speed Chess Poland |
| Jan 2024 | Jakub Kosakowski | Kacper Piorun | 1-0 | Vienna Game | Speed Chess Poland |
| Jan 2024 | Kacper Piorun | Jakub Kosakowski | 0-1 | Caro-Kann: Two Knights Variation | Speed Chess Poland |
| Jan 2024 | Kacper Piorun | Jakub Kosakowski | 1/2-1/2 | Réti Opening | Speed Chess Poland |
| Jan 2024 | Kacper Piorun | Jakub Kosakowski | 0-1 | Réti Opening | chess.com Speed Poland |
| Jan 2024 | Jakub Kosakowski | Kacper Piorun | 1/2-1/2 | French Defense | Speed Chess Poland |
| Jan 2024 | Kacper Piorun | Jakub Kosakowski | 1-0 | Queen's Gambit Declined: Ragozin Defense | Speed Chess Poland |
| Jan 2024 | Kacper Piorun | Jakub Kosakowski | 0-1 | Caro-Kann: Main Line | Speed Chess Poland |
| Jan 2024 | Kacper Piorun | Jakub Kosakowski | 0-1 | Réti Opening | Speed Chess Poland |
| Jan 2024 | Jakub Kosakowski | Kacper Piorun | 1/2-1/2 | Sicilian: Rossolimo | Speed Chess Poland |
| Jan 2024 | Kacper Piorun | Jakub Kosakowski | 1-0 | Réti Opening | Speed Chess Poland |
| Jan 2024 | Jakub Kosakowski | Kacper Piorun | 0-1 | Bishop's Opening | Speed Chess Poland |
| Jan 2024 | Jakub Kosakowski | Kacper Piorun | 1/2-1/2 | Bishop's Opening | Speed Chess Poland |
| Jan 2024 | Jakub Kosakowski | Kacper Piorun | 1/2-1/2 | French: Winawer Variation | chess.com Speed Poland |
| Jan 2024 | Kacper Piorun | Jakub Kosakowski | 0-1 | Queen's Gambit Declined: Ragozin Defense | Speed Chess Poland |
| Jan 2024 | Jakub Kosakowski | Kacper Piorun | 1/2-1/2 | Sicilian: Rossolimo | Speed Chess Poland |
| Jan 2024 | Jakub Kosakowski | Kacper Piorun | 1-0 | Ruy Lopez: Fianchetto | Speed Chess Poland |
| Jan 2024 | Jakub Kosakowski | Kacper Piorun | 1-0 | Modern Defense | Speed Chess Poland |
| Jan 2024 | Kacper Piorun | Jakub Kosakowski | 0-1 | Colle System | Speed Chess Poland |
| Jan 2024 | Jakub Kosakowski | Kacper Piorun | 1-0 | French Defense | Speed Chess Poland |
| Jan 2024 | Jakub Kosakowski | Kacper Piorun | 1-0 | Modern Defense | Speed Chess Poland |
| Jan 2024 | Kacper Piorun | Jakub Kosakowski | 0-1 | Réti Opening | Speed Chess Poland |
| Jan 2024 | Jakub Kosakowski | Kacper Piorun | 1/2-1/2 | French: Winawer Variation | Speed Chess Poland |
| Oct 2023 | Jakub Kosakowski | Kacper Piorun | 1/2-1/2 | French: Winawer Variation | ch-POL Rapid |
Interactive board, all 29 games, opening explorer and engine analysis.
Browse the gamesFrequently asked questions
What is the head-to-head score between Kacper Piorun and Jakub Kosakowski?
In 29 recorded games, Kacper Piorun has 5 wins, Jakub Kosakowski has 12 wins, and they have drawn 12 times.
How many times have Kacper Piorun and Jakub Kosakowski played each other?
Our database records 29 games between them, from Oct 2023 to Sep 2025.
What openings do Kacper Piorun and Jakub Kosakowski play against each other?
The most common opening in their games is the Réti Opening (3 games), followed by the Sicilian: Rossolimo (2). The full opening breakdown and every game are on this page.