PID: 70637 (K5N1/2BR3n/2P1k3/p3N3/4bnP1/4rQ2/7q/8 w - - 0 1)
Ryder, K
Chess, 1951
#2
8 + 7
SOLUTION
SOUND
Sets
1...Bb1
2.Re7#
1...Bc2
2.Re7#
1...Bd3
2.Re7#
1...Bd5
2.Re7#
1...Bf5
2.Re7#
1...Bxc6+
2.Qxc6#
1...Bg6
2.Re7#
1...Se2
2.Qf7#
1...Sg2
2.Qf7#
1...Sd3
2.Qf7#
1...Sh3
2.Qf7#
1...Sd5
2.Qf7#
1...Sh5
2.Qf7#
1...Sg6
2.Qf7#
Tries
1.Sf7?
threat
2.Sd8#
1...Bxc6+
2.Qxc6#
1...Qh4!
1.Qxe4?
threat
2.Rd6#
2.Re7#
2.Qf5#
1...Qc2
2.Rd6#
2.Re7#
1...Qd2
2.Re7#
2.Qf5#
1...Qh4
2.Rd6#
2.Qf5#
1...Qh5
2.Rd6#
2.Re7#
1...Rd3
2.Sxd3#
2.Sf3#
2.Sc4#
2.Sg6#
2.Sf7#
2.Re7#
2.Qf5#
1...Sd5
2.Rd6#
2.Qxd5#
2.Qf5#
1...Sg6
2.Rd6#
2.Qd5#
2.Qf5#
2.Qc4#
1...Rxe4!
Keys
1.Sd3!
threat
2.Sc5#
1...Bxc6+
2.Qxc6#
1...Rxd3
2.Qxe4#
1...Bxd3
2.Re7#
1...Sxd3
2.Qf7#
1...Qc2
2.Sxf4#
1...Qh5
2.Sxf4#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 0
ADDED MATES = 3
REMOVED MATES = 11
Sets
B(c);N_PINP(D)::R1(F)
B(c);::R1(F)
B(c);CHECK,OGATE,XP(D)::QAR2(A),XB(c)
S(d);OGATE::QAB1(A)
S(d);N_PINP(D),OGATE::QAB1(A)
Tries
Try
S(C);
Threat
S(C)
Vars
B(c);CHECK,OGATE,XP(D)::QAR2(A),XB(c)
Refutation
Q(a);
Try
Q(A);N_SPINP(D),XB(c)
Threat
DUALS(3)
Refutation
R(b);XQ(A)
Actual
S(C);
Threat
S(C)
Vars
B(c);CHECK,OGATE,XP(D)::QAR2(A),XB(c)
R(b);N_GUARD,XS(C)::QAR2(A),XB(c)
B(c);N_PINP(D),XS(C)::R1(F)
S(d);OGATE,XS(C)::QAB1(A)
Q(a);N_GUARD::S(C),XS(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).