r3k2b/pp2pp1r/3p2pp/2p1n3/1q3B1P/P1Pb1NP1/3NP2R/R2QKB2 w q - 6 21
FEN state: r3k2b/pp2pp1r/3p2pp/2p1n3/1q3B1P/P1Pb1NP1/3NP2R/R2QKB2 w q - 6 21 ; Best move: c3b4
The current state of the chess board is: Black rook at a8, black king at e8 and black bishop at h8. Black pawn at a7, black pawn at b7, black pawn at e7, black pawn at f7 and black rook at h7. Black pawn at d6, black pawn at g6 and black pawn at h6. Black pawn at c5 and black knight at e5. Black queen at b4, white bishop at f4 and white pawn at h4. White pawn at a3, white pawn at c3, black bishop at d3, white knight at f3 and white pawn at g3. White knight at d2, white pawn at e2 and white rook at h2. White rook at a1, white queen at d1, white king at e1 and white bishop at f1. Black queenside is the only castle move available. Half move number is 6. Full move number is 21. White to move.