The following position is to be found in V. Ssosin's book Chess Combinations and Traps (Middletown 1936), with the heading "Won by Rubinstein", but no further information is provided. If someone can provide details we would forward this to John Donaldson and Nikolay Minev, who are working on the second edition of their work on Akiba Rubinstein.

Akiba Rubinstein, source unknown

White to play and mate in four

Obviously White has a clear win with for instance 1.Ra8 g3 2.hxg3+ Kg4 3.Rf8 h4 4.gxh4 gxh4 5.Kh2 etc. But apparently Rubinstein finished the game with an elegant mating combination which is not too difficult to find.

Novomesky/Siran,D, 2002

White to play and win

This clever position was composed as part of a study competition celebrating Jan Timman's 50th birthday. It is difficult to believe. There is nothing White can to to prevent the e-pawn from queening. Obviously the game is going to continue 1.c7 e2 2.c8Q e1Q, and now we have the interesting endgame queen and seven pawns vs queen, for which no tablebases have as yet been generated. The really bizarre point is that the lone queen is not the defender, White must actually win the game.