So does this sometimes reach an unsolvable state? I have a captcha whose digits sum up to 24, a condition that all digits should sum up to 25, and the best chess move is Ne6+ (accepted), but there's no way to get all digits to sum to 25!

mAy@VpepsiVIIm3588tractSibelgiumNe6+

m3588 is the captcha and Ne6+ is the chess move in the above

I've also tried putting something like -5 in the hope that it recognizes negative numbers, but no luck!