rn1nkb1r/p5p1/2p5/qp1B3p/1P1Npp2/B2PPP1N/P1P1Q2P/R2K1R2 w kq - 0 23
FEN state: rn1nkb1r/p5p1/2p5/qp1B3p/1P1Npp2/B2PPP1N/P1P1Q2P/R2K1R2 w kq - 0 23 ; Best move: b4a5
The current state of the chess board is: Black rook at a8, black knight at b8, black knight at d8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at a7 and black pawn at g7. Black pawn at c6. Black queen at a5, black pawn at b5, white bishop at d5 and black pawn at h5. White pawn at b4, white knight at d4, black pawn at e4 and black pawn at f4. White bishop at a3, white pawn at d3, white pawn at e3, white pawn at f3 and white knight at h3. White pawn at a2, white pawn at c2, white queen at e2 and white pawn at h2. White rook at a1, white king at d1 and white rook at f1. Black kingside and black queenside castles are available. Half move number is 0. Full move number is 23. White to move.