PID: 72213 (2r5/B2p4/P5P1/R1qk4/2N1n1Rr/1P2Q3/1Kb3B1/8 w - - 0 1)
Jelfs, H
Chess, 1953
#2
10 + 7
SOLUTION
SOUND
Sets
1...Kc6
2.Rxc5#
2.Qxc5#
1...Bd1
2.Qxe4#
1...Bxb3
2.Qxe4#
Tries
1.Bxe4+?
1...Bxe4
2.Qxe4#
1...Ke6!
1.Rg5+?
1...Kc6
2.Raxc5#
2.Rgxc5#
2.Qxc5#
1...Ke6!
1.Qxc5+?
1...Ke6
2.Qe5#
1...Rxc5!
Keys
1.Qf4!
threat
2.Qd6#
1...Kd4
2.Qd6#
1...Kc6
2.Rxc5#
1...Ke6
2.Qf7#
1...Bxb3
2.Qxe4#
1...Rc6
2.Qe5#
1...d6
2.Qxd6#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 0
ADDED MATES = 5
REMOVED MATES = 1
Sets
B(a);N_GUARD::QAB1(D),XS(b)
B(a);N_GUARD,XP(C)::QAB1(D),XS(b)
Tries
Try
B(B);CHECK,XS(b)
Vars
B(a);OGATE,XB(B)::QAB1(D),XB(a)
Refutation
K(e);N_SPINQ(d),S_FLIGHT
Try
R(F);CHECK
Refutation
K(e);N_SPINQ(d),S_FLIGHT
Try
Q(D);CHECK,XQ(d)
Vars
K(e);N_SPINS(b),OGATE,S_FLIGHT::QAR1(D)
Refutation
R(g);P_SPINR(g),XQ(D)
Actual
Q(D);
Threat
QAR1(D)
Vars
K(e);P-FLIGHT::QAR2(D)
K(e);N_SPINQ(d),S_FLIGHT::R1(G),XQ(d)
K(e);N_SPINQ(d),N_SPINS(b),S_FLIGHT::QAB1(D)
B(a);N_GUARD,XP(C)::QAB1(D),XS(b)
R(g);SBLOCK::QAR1(D)
P(f);::QAR1(D),XP(f)
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).