rnb2bkr/pp2n3/2p2P2/4P1pp/1q2B2P/P6N/2PPQN2/R1B2RK1 b - - 4 23
FEN state: rnb2bkr/pp2n3/2p2P2/4P1pp/1q2B2P/P6N/2PPQN2/R1B2RK1 b - - 4 23 ; Best move: b4b5
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black bishop at f8, black king at g8 and black rook at h8. Black pawn at a7, black pawn at b7 and black knight at e7. Black pawn at c6 and white pawn at f6. White pawn at e5, black pawn at g5 and black pawn at h5. Black queen at b4, white bishop at e4 and white pawn at h4. White pawn at a3 and white knight at h3. White pawn at c2, white pawn at d2, white queen at e2 and white knight at f2. White rook at a1, white bishop at c1, white rook at f1 and white king at g1. Both players have exhausted their castles. Half move number is 4. Full move number is 23. Black to move.