r1bqk1nb/2p5/4p2r/pp1pp1P1/PQ4Pp/NBPP4/RP3K1P/2B3NR w q - 0 21
FEN state: r1bqk1nb/2p5/4p2r/pp1pp1P1/PQ4Pp/NBPP4/RP3K1P/2B3NR w q - 0 21 ; Best move: b4c5
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8, black knight at g8 and black bishop at h8. Black pawn at c7. Black pawn at e6 and black rook at h6. Black pawn at a5, black pawn at b5, black pawn at d5, black pawn at e5 and white pawn at g5. White pawn at a4, white queen at b4, white pawn at g4 and black pawn at h4. White knight at a3, white bishop at b3, white pawn at c3 and white pawn at d3. White rook at a2, white pawn at b2, white king at f2 and white pawn at h2. White bishop at c1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 21. White to move.