Grob Opening London Defense Discovered Check in Chess
The Grob Opening London Defense Discovered Check is a tactical motif where a piece moves away (often from a line like the diagonal or file) and reveals a check on the enemy king. In the Grob–London family, it typically arises after a flexible London setup where your pieces can “unmask” an attack while the opponent’s king is exposed. The defining feature is the discovered check created by a move that simultaneously changes the line of attack and gives check.
To spot it, look for moments when your own piece can move with tempo while opening a direct line to the king—especially when the king sits on a vulnerable diagonal or file relative to your queen, bishop, or rook. In practice, you often create the condition by placing a piece so that it blocks a powerful line, then using a tactical move (a “reveal”) to turn that blocker into a checker. When playing for it, calculate whether the discovered-check move also attacks a key defender; if the opponent can capture the revealing piece or interpose immediately, the motif may fail.
Frequently Asked Questions: Grob Opening London Defense Discovered Check
- What exactly makes a tactic a “Grob Opening London Defense Discovered Check” rather than a normal check?
- It’s specifically a discovered check: one of your moves removes a blocker and reveals a line attack on the king, and the check comes from the newly opened line (not from the moving piece alone). In this theme, the setup comes from the Grob–London structure where your pieces can align for an unmasking attack.
- Which pieces usually deliver the discovered check in this motif?
- Most often it’s a queen, bishop, or rook that becomes active after a blocker moves away. The key is that the revealed line must already point toward the enemy king once the blocking piece shifts.
- How can I recognize the “setup” for the discovered check during the opening?
- Watch for positions where a bishop/rook/queen line runs toward the opponent’s king but is currently blocked by one of your own pieces. If that blocker has a legal move that also creates tempo (check) and doesn’t lose immediately to capture or interposition, you may have the motif.
- What’s the most common way opponents refute this discovered check?
- They often respond by capturing the revealing piece, blocking the newly opened line with an interposition, or using a king move that breaks the line before the check can stabilize. If the check is only temporary and you lose the piece that made the discovery, the tactic won’t be sound.