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See it for yourselfAbout this chess game
This chess game between Niko Mustonen (1971) and Pekka Koykka (2359) was played at 33. Heart of Finland Op in 2025 and finished 0-1. The opening was the Slav Defense (D10).
You can replay the full game move by move on the interactive board above, or open it on the CipherChess analysis board to study every move with the Stockfish engine.
Looking for more Niko Mustonen games or Pekka Koykka games? This Niko Mustonen vs Pekka Koykka encounter is one of millions of chess games indexed in the CipherChess mega database. Browse both players' full records, the openings they play most, and head-to-head results, then load any game onto the board to prepare your own lines against the Slav Defense.
Frequently asked questions
Who won Niko Mustonen vs Pekka Koykka?
Niko Mustonen vs Pekka Koykka (2025) finished 0-1, a win for Pekka Koykka.
What opening was played in Niko Mustonen vs Pekka Koykka?
The game opened with the Slav Defense (ECO D10).
Can I replay this chess game move by move?
Yes. Use the interactive board on this page to step through every move of Niko Mustonen vs Pekka Koykka, or open it on the CipherChess analysis board to review it with the Stockfish engine.