r4bnr/p1qn4/2pk2pp/3PppP1/P1bP4/P6P/1R2PP2/2Q1KBNR w K - 1 21
FEN state: r4bnr/p1qn4/2pk2pp/3PppP1/P1bP4/P6P/1R2PP2/2Q1KBNR w K - 1 21 ; Best move: d5c6
The current state of the chess board is: Black rook at a8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at a7, black queen at c7 and black knight at d7. Black pawn at c6, black king at d6, black pawn at g6 and black pawn at h6. White pawn at d5, black pawn at e5, black pawn at f5 and white pawn at g5. White pawn at a4, black bishop at c4 and white pawn at d4. White pawn at a3 and white pawn at h3. White rook at b2, white pawn at e2 and white pawn at f2. White queen at c1, white king at e1, white bishop at f1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 1. Full move number is 21. White to move.