[Retros] 8th row mates by knight promotion

[Olli Heimo]

Olli Heimo kirjoitti 26.12.2006 kello 20:52:

> The groups that I improved are:

> b (earlier record 8.0), c (8.0), g (8.5), bxa (7.0),

> axb (8.0), cxb (7.0), dxc (8.0), dxe (9.0), fxe (9.0),

> fxg (8.0) and hxg (8.5).

> If there is something left in 48 hours from now then I will

> publish the remaining. Olli.

Hello!
48 hours have passed and I got answer to two groups from Andrew.
Here are the remaining:
Please enjoy, I think that some of those are quite pretty.
To Hirokaz: If you prepare a new clean list to continue
our work, you could add my 6.dxe8Q (similar with 6.dxe8R).
It was missing from the 21.12.06 list.

b:
1Sbqsbsr/r1pkpppp/R7/3p4/8/8/1PPPPPPP/1SBQKBSR
13 single moves.	16 + 14
1.Pa2-a4   Pd7-d5   2.Pa4-a5   Sb8-d7   3.Pa5-a6   Sd7-f6   
4.Pa6xb7   Ke8-d7   5.Ra1xa7   Sf6-e8   6.Ra7-a6   Ra8-a7   
7.Pb7-b8=S 

c:
rsS3Qr/p2pkp1p/1p2pq1b/8/8/8/PPPP1PPP/RSB1KBSR
15 single moves.	16 + 12
1.Pe2-e4   Pb7-b6   2.Qd1-g4   Bc8-b7   3.Qg4xg7   Bb7-d5   
4.Pe4xd5   Pe7-e6   5.Pd5-d6   Qd8-f6   6.Pd6xc7   Ke8-e7   
7.Qg7xg8   Bf8-h6   8.Pc7-c8=S 

g:
rsbqkbs1/ppppppp1/8/8/4P3/7r/PPPPKP1R/RSBSQBs1
14 single moves.	14 + 16
1.Pe2-e4   Ph7-h5   2.Sg1-e2   Ph5-h4   3.Se2-c3   Ph4-h3   
4.Ke1-e2   Ph3xg2   5.Qd1-e1   Rh8xh2   6.Sc3-d1   Rh2-h3   
7.Rh1-h2   Pg2-g1=S 

bxa:
I had identic position with Andrew.
bxaN
Nnbq1bnr/p1kp1ppp/4p3/3Q4/2p5/8/PP1PPPPP/RNB1KBNR
PG in 6.5.

axb:
1Sbq1bsr/1ppkpBpp/3p4/8/2Ps4/8/P2P1PPP/RSBQK1SR
15 single moves.	15 + 13
1.Pb2-b4   Sb8-c6   2.Pb4-b5   Sc6-d4   3.Pb5-b6   Sd4xe2   
4.Pb6xa7   Se2-d4   5.Bf1-c4   Pd7-d6   6.Bc4xf7   Ke8-d7   
7.Pc2-c4   Ra8-b8   8.Pa7xb8=S

cxb:
I had different matrix than Andrew, but I think that
he did it better:
cxbN
1Nb1qbnr/1p1kpppp/1Q6/r2p4/p7/8/PPP1PPPP/RNB1KBNR
PG in 6.5.

dxc:
rsb1kbsr/ppp1pppp/8/8/8/2S1PS2/PPq1KPPP/R1s1QR2
14 single moves.	12 + 16
1.Pe2-e3   Pd7-d5   2.Bf1-c4   Pd5xc4   3.Sg1-f3   Qd8-d3   
4.Rh1-f1   Qd3xc2   5.Ke1-e2   Pc4-c3   6.Qd1-e1   Pc3xd2   
7.Sb1-c3   Pd2xc1=S

dxe:
rsb1kbsr/pppp1p1p/8/6P1/7q/4PK2/PPP1B1PP/RSB1s1SR
14 single moves.	14 + 15
1.Pf2-f4   Pe7-e5   2.Ke1-f2   Pe5-e4   3.Qd1-e1   Pe4-e3   
4.Kf2-f3   Pe3xd2   5.Pe2-e3   Qd8-h4   6.Bf1-e2   Pg7-g5   
7.Pf4xg5   Pd2xe1=S 

fxe:
r1b1Sbsr/ppp1p1pp/1s1p1k2/7Q/8/1B6/PPPP1PPP/RSB1K1SR
15 single moves.	16 + 14
1.Pe2-e4   Pd7-d6   2.Pe4-e5   Sb8-d7   3.Pe5-e6   Sd7-b6   
4.Pe6xf7   Ke8-d7   5.Qd1-h5   Kd7-e6   6.Bf1-c4   Ke6-f6   
7.Bc4-b3   Qd8-e8   8.Pf7xe8=S

fxg:
rsb1k1sr/pppp1ppp/8/2b5/7q/R2P1K2/PPP1P1P1/RSBQ1Bs1
14 single moves.	13 + 16
1.Ph2-h4   Pe7-e5   2.Rh1-h3   Pe5-e4   3.Rh3-a3   Pe4-e3   
4.Pd2-d3   Pe3xf2   5.Ke1-d2   Qd8xh4   6.Kd2-e3   Bf8-c5   
7.Ke3-f3   Pf2xg1=S 

hxg:
rsbq1bS1/p1p1kpp1/3pp3/1Q4r1/8/4P3/PPPP1PP1/RSB1KBSR
15 single moves.	16 + 13
1.Pe2-e3   Ph7-h5   2.Qd1xh5   Pb7-b5   3.Qh5xb5   Rh8-h5   
4.Ph2-h4   Rh5-g5   5.Ph4-h5   Pe7-e6   6.Ph5-h6   Ke8-e7   
7.Ph6-h7   Pd7-d6   8.Ph7xg8=S

Happy New Year Olli.


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