A Beginner's Scenario: I castle kingside prior to ever being in check. Then, my son positions his queen and on a subsequent turn, takes out the middle pawn of three (see diagram below), thus exposing my king, and declares "checkmate". Is this a legal move on his part? Or, may I take out his queen with my king?

our gameboard http://www.chessvideos.tv/bimg/9ynvc7mbk38f.png

A Beginner's Scenario: I castle kingside prior to ever being in check. Then, my son positions his queen and on a subsequent turn, takes out the middle pawn of three (see diagram below), thus exposing my king, and declares "checkmate". Is this a legal move on his part? Or, may I take out his queen with my king?

A Beginner's Scenario: I castle kingside prior to ever being in check. Then, my son positions his queen and on a subsequent turn, takes out the middle pawn of three (in front of my castle and king) thus exposing my king, and declares "checkmate". Is this a legal move on his part? Or, may I take out his queen with my king?

A Beginner's Scenario: I castle kingside prior to ever being in check. Then, my son positions his queen and on a subsequent turn, takes out the middle pawn of three (see diagram below), thus exposing my king, and declares "checkmate". Is this a legal move on his part? Or, may I take out his queen with my king?

our gameboard http://www.chessvideos.tv/bimg/9ynvc7mbk38f.png