1rb2k1r/1pnp2pp/6n1/p7/1P2N3/B1pP2PP/P3KP1R/RN3B2 w - - 0 21
FEN state: 1rb2k1r/1pnp2pp/6n1/p7/1P2N3/B1pP2PP/P3KP1R/RN3B2 w - - 0 21 ; Best move: b4b5
The current state of the chess board is: Black rook at b8, black bishop at c8, black king at f8 and black rook at h8. Black pawn at b7, black knight at c7, black pawn at d7, black pawn at g7 and black pawn at h7. Black knight at g6. Black pawn at a5. White pawn at b4 and white knight at e4. White bishop at a3, black pawn at c3, white pawn at d3, white pawn at g3 and white pawn at h3. White pawn at a2, white king at e2, white pawn at f2 and white rook at h2. White rook at a1, white knight at b1 and white bishop at f1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. White to move.