Prospect v. Hoffman: An Important Drawing Technique

Prospect lost for the first time this season to Hoffman Estates, 46-22. Prospect had winning chances on 4th and 7th Boards and drawing chances on 3rd and 6th, but was unable to convert.

The drawing chances on 6th came in a position similar to this.   If White is to move here, he wins easily with 1.Rd6+.  However, if it's Black's move, he draws with 1...Qc3+ 2.Kb1 Qb3+ 3.Kc1 Qc3+.  White has no way to escape the queen checks as long as Black keeps his queen on the same file as the White queen.  Unfortunately, in the match White played 3...Qa3+? which allowed the White king to get to safety with 4.Kd2.