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He later wrote on Twitter: “Those reporting how @GeorgeHWBush will vote this year, it’s not clear anyone was there to verify KKT. Still checking, keep your powder dry.”

It will be perceived that after castling with the king’s rook the latter will occupy the KB square, while the king stands on the KKt square, and if with the queen’s rook, the latter will occupy the queen’s square while the king stands on the QB square.

Place the remaining eight White pieces thus: K at KB 4th, Q at QKt 6th, R at Q 6th, R at KKt 7th, B at Q 5th, B at KR 8th, Kt at QR 5th, and Kt at QB 5th.

It deprives Black's QB of its only good square, and saves the KKt, the co-operation of which is urgently needed in the centre.

B-K2 is preferred nowadays to B- QB4, as QB4 should be kept free for the KKt in case the latter is driven from his dominating position, e.g.