1r2kbnr/pb1n3p/Bpq2pp1/2p1p3/1P2pP2/NN5P/P1PP2PR/R1BQ1K2 w k - 4 17
FEN state: 1r2kbnr/pb1n3p/Bpq2pp1/2p1p3/1P2pP2/NN5P/P1PP2PR/R1BQ1K2 w k - 4 17 ; Best move: a6b5
The current state of the chess board is: Black rook at b8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at a7, black bishop at b7, black knight at d7 and black pawn at h7. White bishop at a6, black pawn at b6, black queen at c6, black pawn at f6 and black pawn at g6. Black pawn at c5 and black pawn at e5. White pawn at b4, black pawn at e4 and white pawn at f4. White knight at a3, white knight at b3 and white pawn at h3. White pawn at a2, white pawn at c2, white pawn at d2, white pawn at g2 and white rook at h2. White rook at a1, white bishop at c1, white queen at d1 and white king at f1. Black kingside is the only castle move available. Half move number is 4. Full move number is 17. White to move.