[Retros] Promotion SPGs

[Ulrich Ring]

Some Pawn->Knight examples:

(1) rsbS1bsr/p1p2ppp/2k5/1p6/3Q4/8/PPP1PPPP/RSBK1BSR
    SPG 6.5

It's rather trivial if the promoted Pawn moves,
for example:

(2) 1sbskb1r/p1Spqppp/4p3/8/8/8/1PPPPPPP/RSBQKBSR
    SPG 5.5

(3) rsbqkb2/ppppsp2/4pS2/8/6p1/8/PPPPPP1P/RSBQKBSR
    SPG 5.5

(4) rs1qkbr1/p2psppp/3Sp3/8/2p5/8/PP1PPPPP/RSBQKBSR
    SPG 5.5

...or with a move of a promoted Bishop:

(5) ts1d1lkt/bbb1b1bb/4Lb2/7s/8/8/BBB1BBBB/TSLDKLST
    SPG 5.5 (b)wPe2->c2 

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Solutions:

(1)
1.d4 e5 2.de5: d5 3.e6 d4 4.e7 Kd7 5.Dd4: Kc6
6.Kd1 b5 7.ed8:S#

(2)
1.a4 e6 2.a5 Se7 3.a6 Sec6 4.ab7: De7 5.ba8:S Sd8 6.Sc7:#

(3)
1.g4 e6 2.g5 Se7 3.g6 Tg8 4.gh7: g5 5.hg8:S g4 6.Sf6#

(4)
1.c4 e6 2.c5 Se7 3.c6 Tg8 4.cb7: c5 5.bc8:S c4 5.Sd6#

(5)
1.c4(e4) Sf6 2.c5(e5) Sh5 3.c6(e6) f6 4.cd7:(ed7:) Kf7
5.dc8:L Kg8 6.Le6#

Best, Ulrich