PID: 63996 (1n2BNQK/4q2p/2NRPk2/8/6P1/6nr/8/8 w - - 0 1)
Legge, AD
Chess, 1946
#2
8 + 6
SOLUTION
SOUND
Sets
1...Qxd6
2.Qg7#
1...Qd8
2.Qg7#
1...Qxf8
2.e7#
1...Qxe6
2.Rxe6#
2.Qg7#
1...Qa7
2.e7#
1...Qb7
2.e7#
1...Qd7
2.exd7#
1...Qf7
2.exf7#
1...Qg7+
2.Qxg7#
1...Qxe8
2.Qg7#
2.e7#
1...Sf5
2.g5#
1...h5
2.Qg6#
1...h6
2.Qg6#
Tries
1.Sd7+?
1...Qxd7
2.exd7#
1...Sxd7!
1.Rd5?
threat
2.Qg5#
2.g5#
1...Qg7+
2.Qxg7#
1...Qxf8
2.g5#
1...Se4
2.Rf5#
1...Sf5
2.Rxf5#
2.g5#
1...h6
2.Qg6#
1...Rh5!
Keys
1.Bf7!
threat
2.Qg7#
1...Qxf8
2.e7#
1...Qxf7
2.exf7#
1...Sf5
2.g5#
1...Sh5
2.Sxh7#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 0
ADDED MATES = 1
REMOVED MATES = 8
Sets
Q(d);N_GUARD,XR(C)::QAB1(G)
Q(d);N_GUARD::QAB1(G)
Q(d);OGATE,P_PINQ(G),XS(F)::R(C)+P(D)
Q(d);OGATE::R(C)+P(D)
Q(d);OGATE::R(C)+P(D),XQ(d)
Q(d);CHECK,N_GUARD::QAB1(G),XQ(d)
S(a);SBLOCK::P(A)
P(e);N_GUARD::QAR1(G)
Tries
Try
S(F);CHECK
Vars
Q(d);OGATE,XS(F)::R(C)+P(D),XQ(d)
Refutation
S(f);XS(F)
Try
R(C);
Threat
DUALS(2)
Vars
Q(d);CHECK,N_GUARD::QAB1(G),XQ(d)
Q(d);P_PINQ(G),XS(F)::P(A)
S(a);N_GUARD::R1(C)
P(e);N_GUARD::QAR1(G)
Refutation
R(b);
Actual
B(E);
Threat
QAB1(G)
Vars
Q(d);OGATE,P_PINQ(G),XS(F)::R(C)+P(D)
Q(d);OGATE,XB(E)::R(C)+P(D),XQ(d)
S(a);SBLOCK::P(A)
S(a);S_CUTR(b)::S(F),XP(e)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).