PID: 11030 (Kb5B/n2Np3/4r1p1/3N4/B1k5/3p4/6Q1/2n5 w - - 0 1)
Cox, C
Chess, 1936
#2
6 + 8
SOLUTION
SOUND
Sets
1...Re4
2.Qxe4#
1...Ra6
2.Qe4#
1...Rb6
2.Qe4#
1...Rc6
2.Qe4#
1...Rd6
2.Qe4#
1...Rf6
2.Qe4#
1...Sa2
2.Qxa2#
Tries
1.S5b6+?
1...Rxb6
2.Qe4#
1...Kb4!
1.Qa2+?
1...Sb3
2.Qxb3#
1...Sxa2!
1.Qg4+?
1...Kxd5
2.Qd4#
1...Re4
2.Qxe4#
1...Bf4!
Keys
1.Qb2!
threat
2.Qd4#
1...Kxd5
2.Qd4#
1...Re4
2.S5b6#
1...Re5
2.S5b6#
1...Rf6
2.Se3#
1...Be5
2.Se3#
1...Se2
2.Qa2#
2.Qb3#
1...Sb3
2.Qxb3#
1...Sb5
2.Qxb5#
1...Sc6
2.S5b6#
2.Qb5#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 2
ADDED MATES = 5
REMOVED MATES = 5
Sets
R(d);N_GUARD::QAR2(A),XR(d)
R(d);N_GUARD::QAR2(A)
S(a);N_GUARD::QAB(A),XS(a)
Tries
Try
S(C);CHECK
Vars
R(d);XS(C)::QAR2(A)
Refutation
K(c);P-FLIGHT
Try
Q(A);CHECK
Vars
S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
Refutation
S(a);XQ(A)
Try
Q(A);CHECK
Vars
K(c);S_FLIGHT,XS(C)::QAR1(A)
R(d);N_GUARD,P_SPINR(d)::QAR2(A),XR(d)
Refutation
B(h);P_SPINB(h)
Actual
Q(A);
Threat
QAR1(A)
Vars
K(c);S_FLIGHT,XS(C)::QAR1(A)
R(d);N_GUARD::S(C)
B(h);S_CUTR(d)::S(C)
S(a);N_GUARD::QAB1(A),XS(a)
S(f);N_GUARD::QAB1(A),XS(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).