Great sacrifices
Impelled by his engineer’s mindset, the former world champion Mikhail Botvinnik wrote a short essay to answer a simple question: ‘What is a combination?’ I like his succinct conclusion, which certainly captures the essence: ‘A combination is a forced variation with a sacrifice.’ Like the fizz in champagne, the sacrificial element is the sine qua non and the va va voom. In its absence, a forcing manoeuvre of the pieces may, like wine, still have much to recommend it, but it is a different libation. Nonetheless, an avid taxonomist might like to ponder Nigel Short’s victory against Jan Timman from Tilburg 1991, where the sacrifice of a rook is