1r1qk1n1/p1n1b1r1/3p1p2/PbP1p1pp/2P1P1PP/3P1P1R/3B2B1/RN2K1N1 w Q - 0 21
FEN state: 1r1qk1n1/p1n1b1r1/3p1p2/PbP1p1pp/2P1P1PP/3P1P1R/3B2B1/RN2K1N1 w Q - 0 21 ; Best move: c4b5
The current state of the chess board is: Black rook at b8, black queen at d8, black king at e8 and black knight at g8. Black pawn at a7, black knight at c7, black bishop at e7 and black rook at g7. Black pawn at d6 and black pawn at f6. White pawn at a5, black bishop at b5, white pawn at c5, black pawn at e5, black pawn at g5 and black pawn at h5. White pawn at c4, white pawn at e4, white pawn at g4 and white pawn at h4. White pawn at d3, white pawn at f3 and white rook at h3. White bishop at d2 and white bishop at g2. White rook at a1, white knight at b1, white king at e1 and white knight at g1. White queenside is the only castle move available. Half move number is 0. Full move number is 21. White to move.