PID: 72122 (2B5/4R3/5pr1/7Q/RNq1bkP1/5p1K/4pP2/8 w - - 0 1)
Peake, JL
Chess, 1952
#2
8 + 7
SOLUTION
SOUND
Sets
1...Qa2
2.Sd3#
1...Qd3
2.Sxd3#
1...Qd5
2.Sxd5#
1...Qa6
2.Sd5#
1...Qe6
2.Sd3#
1...Qf7
2.Sd3#
1...Qg8
2.Sd3#
1...Qc1
2.Sd3#
2.Sd5#
1...Qc2
2.Sd5#
1...Qc3
2.Sd5#
1...Qc5
2.Sd3#
1...Qc6
2.Sd3#
1...Qc7
2.Sd3#
2.Sd5#
1...Qxc8
2.Sd3#
2.Sd5#
1...Rxg4
2.Qxg4#
1...Rh6
2.Qxh6#
1...Bb1
2.Sd5#
1...Bc2
2.Sd5#
1...Bd3
2.Sxd3#
2.Sd5#
1...Bd5
2.Sd3#
2.Sxd5#
2.Qf5#
1...Bf5
2.Sd5#
2.Qxf5#
1...Bc6
2.Sd3#
2.Qf5#
1...Bb7
2.Sd3#
2.Qf5#
1...Ba8
2.Sd3#
2.Qf5#
Tries
1.Sd3+?
1...Qxd3
2.Qf5#
1...Bxd3!
1.Sd5+?
1...Bxd5
2.Qf5#
1...Qxd5!
1.Rxe4+?
1...Qxe4
2.Sd3#
2.Sd5#
1...Kxe4!
1.Qxg6?
threat
2.Qh6#
1...Qe6
2.Sd3#
1...Qb5
2.Rxe4#
1...Qd5
2.Sxd5#
1...Qg8
2.Sd3#
2.Rxe4#
1...Qc5
2.Sd3#
2.Rxe4#
1...Bxg6!
Keys
1.Qh4!
threat
2.g5#
1...Qxc8
2.Sd3#
2.Sd5#
1...Rxg4
2.Qxg4#
1...Qe6
2.Sd3#
1...Rg5
2.Qg3#
1...Rh6
2.Qxh6#
1...Bf5
2.Sd5#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 0
ADDED MATES = 2
REMOVED MATES = 12
Sets
Q(c);N_GUARD,S_CUTB(d)::S(D)
Q(c);N_GUARD,S_CUTB(d)::S(D),XQ(c)
Q(c);N_GUARD,P_PINP(E),S_CUTB(d)::S(D)
R(g);OGATE,XP(E)::QAR1(F),XR(g)
R(g);N_GUARD,P_PINQ(F)::QAB(F),XR(g)
B(d);N_GUARD,S_CUTQ(c)::S(D)
Tries
Try
S(D);CHECK
Vars
Q(c);P_SPINB(d),XS(D)::QAR1(F)
Refutation
B(d);P_SPINQ(c),XS(D)
Try
S(D);CHECK
Vars
B(d);P_SPINQ(c),XS(D)::QAR1(F)
Refutation
Q(c);P_SPINB(d),XS(D)
Try
R(G);CHECK,XB(d)
Refutation
K(e);P-FLIGHT,XR(G)
Try
Q(F);XR(g)
Threat
QAB(F)
Vars
Q(c);N_GUARD,P_PINP(E),S_CUTB(d)::S(D)
Q(c);N_GUARD::R1(G),XB(d)
Q(c);N_GUARD,S_CUTB(d)::S(D),XQ(c)
Refutation
B(d);XQ(F)
Actual
Q(F);
Threat
QAR(F)+P(E)
Vars
R(g);OGATE,P_SPINR(g),XP(E)::QAR1(F),XR(g)
Q(c);N_GUARD,P_PINP(E),S_CUTB(d)::S(D)
R(g);SBLOCK::QAB1(F)
R(g);N_GUARD,P_PINQ(F)::QAB(F),XR(g)
B(d);N_GUARD,P_PINP(E),S_CUTQ(c)::S(D)
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).