25-50 he's checkraising me again

[FatalError]

3 hands ago villian checkraised me on K77 FD board and showed A6 w/ no draw at showdown

4 handed 25-50
i have 6k villian covers

fold to villian who limps SB
i raise Q9s to 175
villian calls

flop QdTx9d
villian checks, i bet 325, villian c/r to 850 (about same as last hand), i call

turn 3x (pot:1950)
villian leads 1150


i've never seen villian in the game before but he's playing slightly tight for 4 handed