Ah, the contractions were running hard in fast in that episode. “You can’t talk to me like that; you’re not my mother!”
Still very iffy, and probably BS. There are countably many possible openers, some of them really stupid. Data (or any computer programmed to play chess) would be able to see each of them and, very quickly, prune those that don’t lead to promising second and third and fourth etc. moves. Iterate that over all moves, give the programmers a bit of credit for improving scoring and pruning algorithms, and you get one mean chess-playing machine that probably could only be beaten by a faster number-cruncher running similar algorithms.
As Spock knew, only a damaged Enterprise could lose at chess to a biological being. I think Data could have wiped the floor with an obsolete starship, which leaves Troi at checkmate in ten. 