PID: 215130 (Q7/4b3/3R3N/4k1p1/3p1N2/1K3P2/8/8 w - - 0 1)
Anonymous
SEPA, 1942
#2
6 + 4
SOLUTION
SOUND
Sets
1...gxf4
2.Qd5#
Tries
1.Sh5?
threat
2.Qd5#
1...Bxd6
2.Qe4#
1...Kxd6!
1.Sf5?
threat
2.Qe4#
1...Kxf4
2.Qe4#
1...Kxf5
2.Qe4#
1...Bxd6!
1.Sf7+?
1...Kf5
2.Qe4#
1...Kxf4!
1.Rd5+?
1...Kf6
2.Qh8#
1...Kxf4!
1.Rg6?
threat
2.Sd3#
2.Qe4#
1...gxf4
2.Qe4#
1...Bf6
2.Qb8#
1...d3
2.Qe4#
1...Kxf4!
Keys
1.Rf6!
threat
2.Sg4#
1...Kxf6
2.Qh8#
1...Bxf6
2.Qb8#
1...d3
2.Qa1#
1...g4
2.Sxg4#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 0
ADDED MATES = 4
REMOVED MATES = 1
Sets
P(c);SBLOCK,XS(C)::QAR1(F)
Tries
Try
S(C);
Threat
QAR1(F)
Vars
B(d);SBLOCK,XR(D)::QAR1(F)
Refutation
K(b);S_FLIGHT,XR(D)
Try
S(E);
Threat
QAR1(F)
Vars
K(b);S_FLIGHT,XS(C)::QAR1(F)
K(b);P-FLIGHT,XS(E)::QAB1(F)
Refutation
B(d);XR(D)
Try
S(E);CHECK
Vars
K(b);P-FLIGHT::QAB1(F)
Refutation
K(b);S_FLIGHT,XS(C)
Try
R(D);CHECK
Vars
K(b);S_FLIGHT::QAB(F)
Refutation
K(b);S_FLIGHT,XS(C)
Try
R(D);
Threat
DUALS(2)
Vars
P(c);XS(C)::QAR1(F)
B(d);N_GUARD::QAB(F)
P(a);::QAR1(F)
Refutation
K(b);S_FLIGHT,XS(C)
Actual
R(D);
Threat
S(E)
Vars
K(b);OGATEB,S_FLIGHT,XR(D)::QAB(F)
B(d);N_GUARD,SBLOCK,XR(D)::QAB(F)
P(a);OGATEB::QAB(F)
P(c);::S(E),XP(c)
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).