PID: 185912 (1K2B3/8/3NQb2/6q1/3k4/2R2b2/N7/8 w - - 0 1)
Popov, G?
Chess, 1957
#2
6 + 4
SOLUTION
SOUND
Sets
1...Qc1
2.Sb5#
2.Sf5#
1...Qd2
2.Sb5#
2.Sf5#
1...Qe3
2.Sb5#
2.Sf5#
1...Qh4
2.Sb5#
2.Sf5#
1...Qh6
2.Sb5#
2.Sf5#
1...Qg1
2.Sb5#
2.Sf5#
1...Qg2
2.Sb5#
2.Sf5#
1...Qg4
2.Sb5#
1...Qb5+
2.Sxb5#
1...Qd5
2.Qe3#
1...Qe5
2.Qc4#
1...Qf5
2.Sxf5#
1...Qg6
2.Sb5#
1...Qg7
2.Sb5#
2.Sf5#
1...Qg8
2.Sb5#
2.Sf5#
1...Bd1
2.Qe4#
1...Be2
2.Qe4#
1...Be4
2.Qxe4#
1...Bg4
2.Qe4#
1...Bd5
2.Sb5#
1...Bh5
2.Qe4#
1...Be5
2.Qc4#
Tries
1.Sc1?
threat
2.Rc4#
1...Qb5+
2.Sxb5#
1...Qxc1
2.Sb5#
1...Qc5
2.Rd3#
1...Qd5
2.Qe3#
1...Qe5
2.Qc4#
1...Be2
2.Sxe2#
1...Be4
2.Se2#
1...Bd5
2.Se2#
2.Sb5#
1...Be5
2.Qc4#
1...Kxc3!
1.Qf5?
threat
2.Sb5#
2.Rd3#
1...Be5
2.Qd3#
1...Qf4
2.Rd3#
2.Qc5#
1...Qd2
2.Sb5#
2.Qc5#
1...Qe3
2.Sb5#
2.Rc4#
2.Qc5#
1...Qg3
2.Rd3#
2.Qc5#
1...Be2
2.Qe4#
1...Be4
2.Sb5#
2.Qxe4#
1...Bd5
2.Sb5#
1...Bc6
2.Rd3#
1...Qxf5!
Keys
1.Bg6!
threat
2.Rc4#
1...Qb5+
2.Sxb5#
1...Qxg6
2.Sb5#
1...Qc1
2.Sb5#
2.Sf5#
1...Qc5
2.Rd3#
1...Qd5
2.Qe3#
1...Qe5
2.Qc4#
1...Qf5
2.Sxf5#
1...Be2
2.Qe4#
1...Be4
2.Qxe4#
1...Bd5
2.Sb5#
1...Be5
2.Qc4#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 0
ADDED MATES = 1
REMOVED MATES = 4
Sets
Q(c);N_GUARD::S(C)
Q(c);CHECK,N_GUARD::S(C),XQ(c)
Q(c);N_GUARD,SBLOCK::QAB1(D)
Q(c);P_PINS(C),SBLOCK::QAR1(D)
Q(c);N_GUARD::S(C),XQ(c)
B(a);N_GUARD::QAR1(D)
B(a);N_GUARD::QAR1(D),XB(a)
B(a);S_CUTQ(c)::S(C)
B(d);P_PINS(C),SBLOCK::QAR1(D)
Tries
Try
S(A);
Threat
R1(B)
Vars
Q(c);CHECK,N_GUARD::S(C),XQ(c)
Q(c);N_GUARD,XS(A)::S(C)
Q(c);SBLOCK::R1(B)
Q(c);N_GUARD,SBLOCK::QAB1(D)
Q(c);P_PINS(C),SBLOCK::QAR1(D)
B(a);N_GUARD::S(A),XB(a)
B(a);N_GUARD::S(A)
B(d);P_PINS(C),SBLOCK::QAR1(D)
Refutation
K(b);S_FLIGHT,XR(B)
Try
Q(D);
Threat
DUALS(2)
Vars
B(d);P_PINS(C),SBLOCK::QAR1(D)
B(a);N_GUARD::QAR1(D)
B(a);::S(C)
B(a);::R1(B)
Refutation
Q(c);XQ(D)
Actual
B(F);
Threat
R1(B)
Vars
Q(c);CHECK,N_GUARD::S(C),XQ(c)
Q(c);N_GUARD,XB(F)::S(C)
Q(c);SBLOCK::R1(B)
Q(c);N_GUARD,SBLOCK::QAB1(D)
Q(c);P_PINS(C),SBLOCK::QAR1(D)
Q(c);N_GUARD::S(C),XQ(c)
B(a);N_GUARD::QAR1(D)
B(a);N_GUARD::QAR1(D),XB(a)
B(a);S_CUTQ(c)::S(C)
B(d);P_PINS(C),SBLOCK::QAR1(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).