rn1qk1n1/p2pbppr/bpp4p/P3p3/R7/1PN1PP1P/2PPBKP1/2BQ2NR b q - 5 10
FEN state: rn1qk1n1/p2pbppr/bpp4p/P3p3/R7/1PN1PP1P/2PPBKP1/2BQ2NR b q - 5 10 ; Best move: b6b5
The current state of the chess board is: Black rook at a8, black knight at b8, black queen at d8, black king at e8 and black knight at g8. Black pawn at a7, black pawn at d7, black bishop at e7, black pawn at f7, black pawn at g7 and black rook at h7. Black bishop at a6, black pawn at b6, black pawn at c6 and black pawn at h6. White pawn at a5 and black pawn at e5. White rook at a4. White pawn at b3, white knight at c3, white pawn at e3, white pawn at f3 and white pawn at h3. White pawn at c2, white pawn at d2, white bishop at e2, white king at f2 and white pawn at g2. White bishop at c1, white queen at d1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 5. Full move number is 10. Black to move.