rn1q1rk1/1B3p1p/3p3b/pp2p1p1/1PPpP1Pn/P4NBQ/3NK3/3R3R b - - 2 23
FEN state: rn1q1rk1/1B3p1p/3p3b/pp2p1p1/1PPpP1Pn/P4NBQ/3NK3/3R3R b - - 2 23 ; Best move: a5b4
The current state of the chess board is: Black rook at a8, black knight at b8, black queen at d8, black rook at f8 and black king at g8. White bishop at b7, black pawn at f7 and black pawn at h7. Black pawn at d6 and black bishop at h6. Black pawn at a5, black pawn at b5, black pawn at e5 and black pawn at g5. White pawn at b4, white pawn at c4, black pawn at d4, white pawn at e4, white pawn at g4 and black knight at h4. White pawn at a3, white knight at f3, white bishop at g3 and white queen at h3. White knight at d2 and white king at e2. White rook at d1 and white rook at h1. Both players have exhausted their castles. Half move number is 2. Full move number is 23. Black to move.