I am around 990 rating in blitz and tried to play against wally and lost even when we went into a endgame where it se3ms like I'm winning, he will find a trap to trick me.
Ive yet to beat Isabel but I will say once you get past the opening try spending extra time planing for long game look for queen an king checks etc... Plan to drop over 30 mins on game I'll try to beat him tonight. If you give yourself an hour maybe you will beat him