r1b3k1/p2p1pbr/n3p2p/1pp1P1p1/2P5/QP3P1P/3K2P1/RN4NR w - - 0 21
FEN state: r1b3k1/p2p1pbr/n3p2p/1pp1P1p1/2P5/QP3P1P/3K2P1/RN4NR w - - 0 21 ; Best move: c4b5
The current state of the chess board is: Black rook at a8, black bishop at c8 and black king at g8. Black pawn at a7, black pawn at d7, black pawn at f7, black bishop at g7 and black rook at h7. Black knight at a6, black pawn at e6 and black pawn at h6. Black pawn at b5, black pawn at c5, white pawn at e5 and black pawn at g5. White pawn at c4. White queen at a3, white pawn at b3, white pawn at f3 and white pawn at h3. White king at d2 and white pawn at g2. White rook at a1, white knight at b1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. White to move.