r3k1nr/p1p5/1p1pbbpq/1N2p1N1/1P2P2p/Q2P1pPP/P1P2P2/R1B2KR1 b q - 0 20
FEN state: r3k1nr/p1p5/1p1pbbpq/1N2p1N1/1P2P2p/Q2P1pPP/P1P2P2/R1B2KR1 b q - 0 20 ; Best move: f6g5
The current state of the chess board is: Black rook at a8, black king at e8, black knight at g8 and black rook at h8. Black pawn at a7 and black pawn at c7. Black pawn at b6, black pawn at d6, black bishop at e6, black bishop at f6, black pawn at g6 and black queen at h6. White knight at b5, black pawn at e5 and white knight at g5. White pawn at b4, white pawn at e4 and black pawn at h4. White queen at a3, white pawn at d3, black pawn at f3, white pawn at g3 and white pawn at h3. White pawn at a2, white pawn at c2 and white pawn at f2. White rook at a1, white bishop at c1, white king at f1 and white rook at g1. Black queenside is the only castle move available. Half move number is 0. Full move number is 20. Black to move.