PID: 215125 (3B3N/3p1r1Q/R2Pk3/P3b3/1KN2r2/P1p1Pp2/BPpR4/3q4 w - - 0 1)
Anonymous
SEPA, 1942
#2
13 + 9
SOLUTION
SOUND
Sets
1...Rxc4+
2.Bxc4#
1...Rd4
2.Qxf7#
1...Re4
2.Qxf7#
1...Rg4
2.Qxf7#
1...Rh4
2.Qxf7#
1...R4f5
2.Sb6#
1...R4f6
2.Sb6#
1...R7f5
2.Qe7#
1...Bxd6+
2.Raxd6#
Tries
1.Qe4?
threat
2.Sxe5#
2.Sb6#
2.Qxe5#
1...Qxd2
2.Sxd2#
2.Qxe5#
1...cxd2
2.Sxd2#
2.Sxe5#
2.Qxe5#
1...Re7
2.Qxe5#
1...c1Q
2.Qxe5#
1...c1S
2.Qxe5#
1...c1B
2.Qxe5#
1...c1R
2.Qxe5#
1...Qe2
2.Qxe5#
1...Qa1
2.Qxe5#
1...Qb1
2.Qxe5#
1...Qf1
2.Qxe5#
1...R4f5
2.Sxe5#
2.Sb6#
2.Qd5#
1...R7f5
2.Sxe5#
2.Sb6#
2.Qd5#
1...Rxe4!
Keys
1.Qh5!
threat
2.Qxe5#
1...Rxc4+
2.Bxc4#
1...Bxd6+
2.Raxd6#
1...Bxh8
2.Qd5#
1...Re4
2.Qxf7#
1...R4f5
2.Sb6#
1...R7f5
2.Qe8#
1...Bd4
2.Se5#
1...Bf6
2.Qd5#
1...Bg7
2.Qd5#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 1
ADDED MATES = 4
REMOVED MATES = 4
Sets
R(e);CHECK,OGATE,P_SPINR(e),XS(G)::B(A),XR(e)
R(e);N_GUARD::QAB1(K),XR(i)
R(e);N_PINS(G)::B(A)+S(G)
R(i);OGATE,SBLOCK::QAR1(K)
B(f);CHECK,OGATE,P_SPINB(f),XP(J)::R1(I),XB(f)
Tries
Try
Q(K);N_SPINS(G),P_PINB(f)
Threat
DUALS(3)
Vars
R(i);::QAR1(K),XB(f)
P(b);::QAR1(K),XB(f)
Q(a);::QAR1(K),XB(f)
Q(a);P_PINP(B)::QAR1(K),XB(f)
Refutation
R(e);N_SPINB(f),P_PINS(G),XQ(K)
Actual
Q(K);
Threat
QAR1(K),XB(f)
Vars
R(e);CHECK,OGATE,P_SPINR(e),XS(G)::B(A),XR(e)
B(f);CHECK,OGATE,P_SPINB(f),XP(J)::R1(I),XB(f)
B(f);OGATE,XS(M)::QAB1(K)
R(e);N_GUARD::QAB1(K),XR(i)
R(e);N_PINS(G)::B(A)+S(G)
R(i);OGATE,SBLOCK::QAR2(K)
B(f);N_PINS(G)::B(A)+S(G)
B(f);OGATE::QAB1(K)
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).