1nbqk3/r2p2b1/1p2p2n/1QpP1rpp/1P2p3/p1NB2BP/P1P2PP1/1R2K1NR w K - 4 21
FEN state: 1nbqk3/r2p2b1/1p2p2n/1QpP1rpp/1P2p3/p1NB2BP/P1P2PP1/1R2K1NR w K - 4 21 ; Best move: c3e4
The current state of the chess board is: Black knight at b8, black bishop at c8, black queen at d8 and black king at e8. Black rook at a7, black pawn at d7 and black bishop at g7. Black pawn at b6, black pawn at e6 and black knight at h6. White queen at b5, black pawn at c5, white pawn at d5, black rook at f5, black pawn at g5 and black pawn at h5. White pawn at b4 and black pawn at e4. Black pawn at a3, white knight at c3, white bishop at d3, white bishop at g3 and white pawn at h3. White pawn at a2, white pawn at c2, white pawn at f2 and white pawn at g2. White rook at b1, white king at e1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 4. Full move number is 21. White to move.