1r2k1nr/n4pbp/1pq2p2/p1ppp3/P1P1NP1P/3PP1P1/1P5R/R1B1KBN1 b k - 1 18
FEN state: 1r2k1nr/n4pbp/1pq2p2/p1ppp3/P1P1NP1P/3PP1P1/1P5R/R1B1KBN1 b k - 1 18 ; Best move: d5e4
The current state of the chess board is: Black rook at b8, black king at e8, black knight at g8 and black rook at h8. Black knight at a7, black pawn at f7, black bishop at g7 and black pawn at h7. Black pawn at b6, black queen at c6 and black pawn at f6. Black pawn at a5, black pawn at c5, black pawn at d5 and black pawn at e5. White pawn at a4, white pawn at c4, white knight at e4, white pawn at f4 and white pawn at h4. White pawn at d3, white pawn at e3 and white pawn at g3. White pawn at b2 and white rook at h2. White rook at a1, white bishop at c1, white king at e1, white bishop at f1 and white knight at g1. Black kingside is the only castle move available. Half move number is 1. Full move number is 18. Black to move.