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Xadrez

Xadrez

It doesn't play badly on purpose. It just doesn't look at the whole board.

plays fine with your thumb

Chess on a 3D board against an engine written from scratch — minimax with alpha-beta pruning, no libraries. Six levels, and what changes between them isn't just search depth: it's what the bot fails to see. On APPRENTICE it only checks the pieces around the square it just moved to, so it hangs its queen to the bishop that came from the far corner — the mistake everyone makes while learning, not a randomized blunder. From MASTER up it sees the whole board and gives nothing back. Full rules: castling, en passant, promotion, stalemate, threefold repetition, the 50-move rule and insufficient material. The pieces are turned at load time from their profiles, like a real wooden set.

controls
mouse · touch · keyboard
device
either way
players
1
levels
6
difficulty
escolhível

how to play

Chess against an engine written from scratch, on a 3D board. You pick your color and one of six levels, all open from the start. You win by checkmate. The top bar shows the pieces each side has taken, the material edge in pawns and the clock.

Tap or click a piece, or its square, and the destinations light up: a dot on an empty square, a ring on an occupied one. Tap a destination to move, or the piece again to drop it. Dragging spins the camera. UNDO, FLIP, SOUND and MENU are also the keys Z, G, M and ESC.

Full rules: castling, en passant, promotion to any of four pieces, stalemate, threefold repetition, fifty moves and insufficient material. Check pulses on the king's square. UNDO takes back the pair, your move and its own, with no limit. The game saves every move and the resume button brings it back.

Between levels the depth changes, from 2 to 6 half-moves, and on the sixth whatever fits in three and a half seconds. So does the attention radius: when working out your reply, it only looks at pieces within 1, 2, 3 or 5 squares of the move it just made. From the fifth up, the whole board.

tips

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