(20.04.2014) Nice fairy problem by Kenneth Solja with under-promotions, selfblocks and interesting ODT fairy mates.

1.d1S LOxd1-e1(+bSc1) 2.e3 LOxe3-e4(+bPe1S)+

3.Sg2 LOxc4-b4(+bPe4) 4.Se2 LOxe4-f4(+bPb4)#

1.c3 LOxc3-c4(+bPc1B) 2.d1S LOxe4-f4(+bPc4)+

3 Sf2 LOxc4-b4(+bPf4) 4.Be3 LOxf4-g4(+bPb4)#

Under promotions, Fairy mates, White minimal,

Miniature, Echo-mates (Author)

PWC (PlatzWechselCirce): Captured units reappear on the square just vacated by the capturing unit. Pawns appearing on their 1^st rank have no moving or checking power until reactivated by being captured again; those appearing on their 8^th rank are promoted instantly, at the choice of their own side.

Locust: a piece which moves only to capture. It lands on the same squares as a grasshopper, but the arrival square must be empty, because the locust captures its hurdle.