r1b1k2r/pppp1p1p/1N2p3/n7/2P5/3P1PqP/RP1BPNP1/3QKBR1 b k - 8 18
FEN state: r1b1k2r/pppp1p1p/1N2p3/n7/2P5/3P1PqP/RP1BPNP1/3QKBR1 b k - 8 18 ; Best move: a7b6
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black rook at h8. Black pawn at a7, black pawn at b7, black pawn at c7, black pawn at d7, black pawn at f7 and black pawn at h7. White knight at b6 and black pawn at e6. Black knight at a5. White pawn at c4. White pawn at d3, white pawn at f3, black queen at g3 and white pawn at h3. White rook at a2, white pawn at b2, white bishop at d2, white pawn at e2, white knight at f2 and white pawn at g2. White queen at d1, white king at e1, white bishop at f1 and white rook at g1. Black kingside is the only castle move available. Half move number is 8. Full move number is 18. Black to move.