Chess engine

Self-Play Chess

A real bitboard chess engine picks both sides and plays a full game against itself - alpha-beta with iterative deepening (depth 4), a transposition table, null-move pruning, late-move reductions and quiescence search, tapered PeSTO evaluation. Nothing below is scripted; every move, capture, castle and check came from the engine. Replay it move by move.

Replay controls

Starting position

White to move - engine depth 4

60plies played

495,289positions searched

Ongoingresult (60-ply cap)

1.15sengine wall-clock

Read it

Use the arrows or the move list. Keyboard: left/right steps, space plays or pauses. The bar shows the engine's evaluation from White's point of view.

This board replays a deterministic self-play game from the engine's exact per-move FENs. Enable JavaScript to step through all 60 plies.

Move list