r1bq2r1/p1pppk2/n5pb/1p2n1Pp/1PP1pP1P/N5RN/P2P2Q1/R1B1KB2 w Q - 0 21
FEN state: r1bq2r1/p1pppk2/n5pb/1p2n1Pp/1PP1pP1P/N5RN/P2P2Q1/R1B1KB2 w Q - 0 21 ; Best move: g5h6
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8 and black rook at g8. Black pawn at a7, black pawn at c7, black pawn at d7, black pawn at e7 and black king at f7. Black knight at a6, black pawn at g6 and black bishop at h6. Black pawn at b5, black knight at e5, white pawn at g5 and black pawn at h5. White pawn at b4, white pawn at c4, black pawn at e4, white pawn at f4 and white pawn at h4. White knight at a3, white rook at g3 and white knight at h3. White pawn at a2, white pawn at d2 and white queen at g2. White rook at a1, white bishop at c1, white king at e1 and white bishop at f1. White queenside is the only castle move available. Half move number is 0. Full move number is 21. White to move.