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Correction is a theme based on the accumulation of errors. Any move of the d5 knight defeats the threat by allowing 2...Kd5+, but unguards f4. 1...Sb6 compensates by preventing 2.Qc4+, but closes the line b6-g1, allowing White to safely drive the black king to e4. The knight corrects again at e3, closing the line d2-f4, but blocks e3, which White exploits with a model mate. Thus the problem shows Tertiary black correction.
1...S random Primary error: Unguard of f4
1...Sb6 Primary error: Unguard of f4 Correction: Guard of c4 Secondary error: Closure of b6-g1
1...Se3 Primary error: Unguard of f4 Correction: Guard of c4 Secondary error: Closure of b6-g1 Correction: Closure of d2-f4 Tertiary error: Block of e3.
Dafydd Johnston: The contrast between this problem and last week’s could hardly be greater. It was the Klett that made the biggest impression on me, but I suppose it’s a matter of taste.
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