PID: 215122 (3r3B/b4q2/8/1R6/4k1P1/3p2Q1/2P2p2/5K2 w - - 0 1)
Anonymous
SEPA, 1942
#2
6 + 6
SOLUTION
SOUND
Sets
1...Qf3
2.Qe5#
1...Rd4
2.Re5#
1...Ra8
2.cxd3#
1...Rb8
2.cxd3#
1...Rc8
2.cxd3#
1...Re8
2.cxd3#
1...Rf8
2.cxd3#
1...Rg8
2.cxd3#
1...Bd4
2.cxd3#
Tries
1.Bd4?
threat
2.Qe3#
1...Kxd4
2.Qxd3#
1...Rxd4
2.Re5#
1...Bxd4
2.cxd3#
1...Qf3
2.Qe5#
1...Qf4
2.Qxd3#
1...Bc5!
1.Rf5?
threat
2.Qf4#
2.Qe5#
2.Qf3#
1...Rxh8
2.Qf4#
2.Qe5#
2.Qxd3#
1...dxc2
2.Qf3#
1...Qf6
2.Qf4#
1...Qg7
2.Qf4#
1...Qd5
2.Rf4#
2.Qf4#
2.Qf3#
1...Qe6
2.Qf4#
2.Qf3#
1...Qe8
2.Qf4#
2.Qf3#
1...Qc7
2.Qf3#
1...Qe7
2.Qf4#
2.Qf3#
1...Rd5
2.Qf4#
2.Qf3#
1...Re8
2.Qf4#
2.Qxd3#
2.Qf3#
2.cxd3#
1...Be3
2.Qe5#
2.Qg2#
2.Qf3#
1...Bd4
2.Qf4#
2.Qxd3#
2.Qf3#
2.cxd3#
1...Bb8
2.Qf3#
1...Qxf5!
Keys
1.Re5+!
1...Kd4
2.Qxd3#
FEATURES
Static
TYPE = CHECKING_KEY
CHANGED MATES = 0
ADDED MATES = 1
REMOVED MATES = 9
Sets
Q(e);SBLOCK::QAR1(C)
R(f);SBLOCK::R1(E)
R(f);N_GUARD::P(B),XP(b)
B(d);S_CUTR(f)::P(B),XP(b)
Tries
Try
B(F);
Threat
QAR1(C)
Vars
K(c);P-FLIGHT,XB(F)::QAR1(C),XP(b)
R(f);SBLOCK,XB(F)::R1(E)
B(d);SBLOCK,XB(F)::P(B),XP(b)
Q(e);SBLOCK::QAR1(C)
Q(e);SBLOCK::QAB1(C),XP(b)
Refutation
B(d);
Try
R(E);
Threat
DUALS(3)
Vars
P(b);XP(B)::QAB1(C)
Q(e);::QAR1(C)
Q(e);::QAB1(C)
B(d);::QAB1(C)
Refutation
Q(e);XR(E)
Actual
R(E);CHECK
Vars
K(c);P-FLIGHT::QAR1(C),XP(b)
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).