Nikola is right - the bPa3 is missing! The right FEN is 1b1r4/4pp2/1pP1kp2/8/p5K1/pr3p2/Bp2b3/4R3 When Hans wrote his short comment he…
And if you like three phases: Stipulation h#3 Condition Take&MakeChess C+ White Kf5 Pb2 Pe2 Black Kd5 Sc3 Sd3 Qc2…
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Makes a nice comparison with 849 and 950! Remarkable economy to show the same theme!
Very interesting! For position (b) When 'h4' becomes 'd1' I think board turns clockwise !
Thanks Julia! Indeed the diagram position seems more harmonious now...
I presume there's typo in Arno's FEN, 1 instead of p (+bPa3).