For each move type, e.g. plain moves, capturing moves,
etc., find a twinning a) white to move, b) black to move a legal last
move of the "same nature".
I'm posting here the ELM updated status, correcting some mistakes
in previous posting that were kindly indicated by Wener Keym. I repeat
the complete presentation in order to make the things easier for newcomers.
Many of the present records are waiting for improvements. You may send
your originals via this RML or via private mail to me.
The move's nature is determined by the type of the piece/pieces involved
(K, Q, R, B, N, P) and the type of movement (simple, straight promotion,
simple capture, capturing promotion, e.p., pawn double step, O-O, O-O-O).
An ELM problem is not (in general) a Last Move type D one. The diagram
could present many legal candidates to be the last move, but there is
just one for a) and just one for b) that are of the same nature. On
the contrary, all the Last Move type DD problems are particular ELM
ones.
There are 60 theoretical cases (surely 57 in practice due to castlings
and e.p. ??)
We are trying here to find the economy records (minimal pieces number).
On top of records, I think that this stipulation could be used to compose
some nice problems with many tries.
Some examples are a light variation of the previous Type B ones and
they are indicated as such.
Dates are reception ones.
I included the reference of the Last Move Type DD record (Type DD
is the particular Type D cases where the last move is of the same nature
both for WTM and BTM) in the form of DDxx, where xx is the number of
pieces in the corresponding DD record. For instance, in the following
first case the move is K-, after that DD12 indicates that the DD record
uses 12 pieces, and after that (3+2=5) means that the ELM record uses
3 white pieces and 2 black pieces, total 5. Then, the FEN, author and
reception date.
K- |
DD12 |
3+2=5 |
8/8/8/6R1/7k/8/7K/6Rb |
Bernd Schwarzkopf, 09.05.2007 |
KxQ |
DD24 |
1+11=12 |
3nK2k/ppppp2p/4p2n/7p/8/8/8/8 |
Bernd Schwarzkopf, 14.06.2007 |
KxR |
DD22 |
3+3=6 |
bK6/8/bk6/NP6/8/8/8/8 |
Bernd Schwarzkopf, 09.05.2007 |
KxB |
DD14 |
2+3=5 |
K1k5/2rp4/2P5/8/8/8/8/8 |
Bernd Schwarzkopf, Werner Keym, 09.05.2007 |
KxN |
DD10 |
3+2=5 |
K7/8/k7/P7/8/8/7b/6Q1 |
Bernd Schwarzkopf, 09.05.2007 |
KxP |
DD24 |
1+5=6 |
8/8/8/1q1r4/k7/n1K5/5q2/8 |
Bernd Schwarzkopf, 09.05.2007 |
Q- |
DD13 |
5+4=9 |
8/8/8/8/1p6/Pp6/qPP1k3/1QK5 |
Bernd Schwarzkopf, 11.6.2007 |
QxQ |
DD?? |
9+3=12 |
8/8/8/8/8/4P1PP/1K1kPBPq/3N1Q1b |
Bernd Schwarzkopf, 22.06.2007 |
QxR |
DD?? |
7+2=9 |
8/8/8/8/1N6/kPP5/q1PP4/1QK5 |
Bernd Schwarzkopf, 21.06.2007 |
QxB |
DD?? |
7+3=10 |
8/8/8/8/8/PK2B3/1pN1R3/QRqk4 |
Bernd Schwarzkopf 21.06.2007 |
QxN |
DD12 |
5+2=7 |
8/8/8/8/8/P7/1PP5/qQK1k3 |
Thierry Le Gleuher, 14.05.07 |
QxP |
DD26 |
9+2=11 |
4K2B/7k/7N/6RQ/5N1q/5PPP/8/8 |
Werner Keym, 21.06.2007 |
R- |
DD13 |
5+3=8 |
8/8/8/8/1p6/P7/rPP1k3/1RK5 |
Bernd Schwarzkopf, 08.06.2007 |
RxQ |
DD17 |
10+3=13 |
8/8/8/8/8/P1P5/rP1PPPPP/kr1RK3 |
Bernd Schwarzkopf, Werner Keym, 21.06.2007 |
RxR |
DD?? |
8+2=10 |
8/8/8/8/BPK5/1R1P4/BNk5/r1B5 |
Bernd Schwarzkopf,
Roberto Osorio,
Jorge Lois, 21.06.2007 |
RXB |
DD18 |
4+4=8 |
8/8/8/8/1p6/p7/rPP1k3/1RK5 |
Bernd Schwarzkopf, 08.06.2007 |
RXN |
DD9 |
3+4=7 |
8/8/8/8/8/np6/rP2k3/1RK5 |
Bernd Schwarzkopf, 08.06.2007 |
RxP |
DD25 |
6+2=8 |
8/8/4K3/8/7P/4N1NR/5Pr1/6k1 |
Werner Keym, 21.06.2007 |
B- |
DD12 |
7+4=11 |
8/8/1p6/b7/8/P2P4/P1kPP3/K1Bb4 |
Bernd Schwarzkopf, 9.05.2007 |
BxQ |
DD24 |
9+2=11 |
8/8/6P1/4PPP1/7B/5P1P/5KPb/7k |
Werner Keym, 21.06.2007 |
BxR |
DD11 |
2+6=8 |
5b1B/4pK1k/5ppp/8/8/8/8/8 |
Bernd Schwarzkopf, 21.06.2007 |
BxB |
DD27 |
6+4=10 |
4RBkb/3Pp2p/4KPP1/8/8/8/8/8 |
Bernd Schwarzkopf, Werner Keym, 21.06.2007 |
BxN |
DD11 |
6+2=8 |
8/8/8/8/8/4P1PP/5BPb/4K2k |
Bernd Schwarzkopf, 06.06.2007 |
BxP |
DD26 |
8+3=11 |
8/8/6P1/6P1/3K1P1B/7N/5PPb/6nk |
Werner Keym, 21.06.2007 |
N- |
DD11 |
5+2=7 |
8/8/8/8/8/5K2/4PPPk/6Nn |
Bernd Schwarzkopf, 08.06.2007 |
NxQ |
DD17 |
3+4=7 |
6Nk/4p1Rn/4K2p/8/8/8/8/8 |
Bernd Schwarzkopf, Werner Keym, 24.06.07 |
NxR |
DD16 |
3+5=8 |
5BNk/4pK1n/7P/6P1/8/8/8/8 |
Bernd Schwarzkopf, 23.06.2007 |
NXB |
DD19 |
2+7=9 |
5KNr/4r1np/4p3/5k1b/8/8/8/8 |
Roberto Osorio & Jorge Lois, 09.06.07 |
NXN |
DD17 |
5+3=8 |
8/8/8/8/7P/4K1kP/6Pn/6Nb |
Bernd Schwarzkopf, 12.06.2007 |
NxP |
DD25 |
7+3=11 |
8/8/8/5P2/5KPn/7p/6PN/5BBk |
Valentin Blacker
Die Schwalbe, Oct. 2007 |
P- |
DD8 |
2+2=4 |
8/8/8/8/8/6P1/7p/5K1k |
Roberto Osorio, 20.04.2007 |
P-- |
DD17 |
3+3=6 |
8/7p/7P/6pK/5k1P/8/8/8 |
Bernd Schwarzkopf, 09.05.2007 |
PxQ |
DD24 |
3+7=10 |
8/8/8/8/4N1K1/5P1P/6Pp/4BkNb |
Bernd Schwarzkopf, 09.05.2007 |
PxR |
DD21 |
7+2=9 |
8/8/8/4KR2/7P/7P/6Pp/5BkN |
Bernd Schwarzkopf, 09.05.2007 |
PxB |
DD16 |
6+2=8 |
8/8/8/4KN2/7P/7P/6Pp/6Nk |
Bernd Schwarzkopf, 09.05.2007 |
PxN |
DD16 |
5+2=7 |
8/6K1/7P/8/8/7P/6Pp/6Nk |
Bernd Schwarzkopf, 09.05.2007 |
PxP |
DD18 |
5+2=7 |
8/4K3/8/8/7P/5N1N/6Pp/7k |
Bernd Schwarzkopf, Werner Keym, 09.05.2007 |
P-=Q |
DD20 |
5+2=7 |
7Q/8/8/7P/8/6K1/6P1/5Bkq |
Bernd Schwarzkopf, 09.05.2007 |
P-=R |
DD20 |
5+2=7 |
7R/8/8/8/8/6P1/5K1P/5Brk |
Bernd Schwarzkopf, 09.05.2007 |
P-=B |
DD10 |
2+3=5 |
7B/6p1/8/8/8/7K/8/6bk |
Bernd Schwarzkopf, 09.05.2007 |
P-=N |
DD16 |
2+4=6 |
7N/8/8/8/8/8/5pr1/3k1K1n |
Bernd Schwarzkopf, 09.05.2007 |
PxQ=Q |
DD24 |
2+12=14 |
nQr1n3/1ppKp1p1/kp1pp3/8/8/8/8/7q |
Werner Keym, 09.05.2007 |
PxQ=R |
DD23 |
5+6=11 |
6R1/4Kpp1/5ppN/8/8/8/1R6/krN5 |
Bernd Schwarzkopf, 12.06.2007 |
PxQ=B |
DD25 |
2+11=13 |
2b1B3/pp1pp1p1/6p1/8/8/1k6/2rp4/bK6 |
Werner Keym, 21.06.2007 |
PxQ=N |
DD24 |
2+10=12 |
2b2Nr1/1p1p1ppK/4p1p1/8/8/8/7k/6n1 |
Werner Keym, 21.06.2007 |
PXR=Q |
DD?? |
3+6=9 |
4rnQ1/5Kp1/8/8/8/5P1k/4r3/6q1 |
Jorge Lois & Roberto Osorio, 14.06.07 |
PxR=Q |
DD? |
2+8=10 |
nQb5/Kp6/3p4/8/n7/1p6/2k5/q7 Werner Keym 18.6.2007 |
3+6=9 |
PxR=B |
DD24 |
2+8=10 |
4rnBr/5Kp1/4r3/8/8/1p6/2k5/b7 |
Jorge Lois & Roberto Osorio, 2.06.07 |
PxR=N |
DD24 |
3+6=9 |
5bNN/6pK/6p1/8/8/6p1/5k2/7n |
Bernd Schwarzkopf, 22.06.2007 |
PxB=Q |
DD26 |
2+6=8 |
5nQK/5pr1/8/8/8/1p6/2k5/q7 |
Jorge Lois & Roberto Osorio/14.06.07 |
PxB=R |
DD16 |
5+2=7 |
R7/2K5/1R6/8/8/P7/k7/rR6 |
Bernd Schwarzkopf/9.05.2007 |
PxB=B |
DD25 |
2+6=8 |
5nBK/5pr1/8/8/8/1p6/2k5/b7 |
Jorge Lois, Roberto Osorio & Werner Keym, 23.06.07 |
PXB=N |
DD16 |
4+3=7 |
7N/5K1k/6R1/6Q1/8/8/8/6bn |
Roberto Osorio & Jorge Lois, 16.06.07 |
PxN=Q |
DD23 |
5+2=7 |
5nQK/5pr1/8/8/8/8/2k5/1q6 |
Roberto Osorio & Jorge Lois, 16.06.07 |
PxN=R |
DD14 |
4+2=6 |
1R6/2K5/8/8/8/P7/k7/rR6 |
Bernd Schwarzkopf, 9.05.2007 |
PxN=B |
DD24 |
2+7=9 |
5bBn/6pK/4p3/7k/8/8/8/6nb |
Jorge Lois & Roberto Osorio, 2.06.07 |
PxN=N |
DD22 |
2+5=7 |
6KN/5r1r/6n1/8/8/8/2k5/1n6 |
Jorge Lois & Roberto Osorio, 2.06.07 |