Why is https://lichess.org/editor/k7/Pp1p1p1p/1P6/8/8/8/3P1P1P/8_b_--0_1 an illegal position in a horde game? the game has legal moves, white does not need a king, and both sides can play legally, other positions that have the game already decided like https://lichess.org/editor/1R6/8/k7/8/1p6/1p6/K7/R7_w--0_1, and https://lichess.org/editor/8/8/k7/8/8/8/1q6/K7_w-_-_0_1 can be continued
Why is https://lichess.org/editor/k7/Pp1p1p1p/1P6/8/8/8/3P1P1P/8_b_-_-_0_1 an illegal position in a horde game? the game has legal moves, white does not need a king, and both sides can play legally, other positions that have the game already decided like https://lichess.org/editor/1R6/8/k7/8/1p6/1p6/K7/R7_w_-_-_0_1, and https://lichess.org/editor/8/8/k7/8/8/8/1q6/K7_w_-_-_0_1 can be continued