rn2k1nr/p7/2p1p2p/qb1P1p2/PPp3p1/3Rb1PP/4PP1R/1N2KBN1 w kq - 0 23
FEN state: rn2k1nr/p7/2p1p2p/qb1P1p2/PPp3p1/3Rb1PP/4PP1R/1N2KBN1 w kq - 0 23 ; Best move: b4a5
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8, black knight at g8 and black rook at h8. Black pawn at a7. Black pawn at c6, black pawn at e6 and black pawn at h6. Black queen at a5, black bishop at b5, white pawn at d5 and black pawn at f5. White pawn at a4, white pawn at b4, black pawn at c4 and black pawn at g4. White rook at d3, black bishop at e3, white pawn at g3 and white pawn at h3. White pawn at e2, white pawn at f2 and white rook at h2. White knight at b1, white king at e1, white bishop at f1 and white knight at g1. Black kingside and black queenside castles are available. Half move number is 0. Full move number is 23. White to move.