PID: 72182 (3R4/8/1KQr1r2/p4n2/3k2N1/npRp1Bp1/q3b3/b1N1B3 w - - 0 1)
Jelfs, H
Chess, 1952
#2
8 + 12
SOLUTION
SOUND
Sets
1...Qd2
2.Sxb3#
1...Rd5
2.Rxd5#
2.Qxf6#
1...Rd7
2.Qxf6#
1...Rxd8
2.Qxf6#
1...Bxc3
2.Bxc3#
1...Bd1
2.Rxd3#
1...Bxf3
2.Rxd3#
1...Sb1
2.Rc4#
1...Sc2
2.Rc4#
1...Sc4+
2.Rxc4#
1...Sb5
2.Rc4#
1...d2
2.Sxe2#
Tries
1.Bf2+?
1...Se3
2.Bxe3#
1...gxf2!
1.Rxd6+?
1...Sxd6
2.Qd5#
2.Qc5#
1...Rxd6!
Keys
1.Ka6!
threat
2.Qb6#
1...d2+
2.Sxe2#
1...Rxd8
2.Qxf6#
1...Bxc3
2.Bxc3#
1...Bxf3
2.Rxd3#
1...Qd2
2.Sxb3#
1...Rd5
2.Rxd5#
2.Qxf6#
1...Rd7
2.Qxf6#
1...Sc4
2.Rxc4#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 0
ADDED MATES = 0
REMOVED MATES = 4
Sets
Q(b);N_GUARD::S(A),XP(e)
R(k);::QAB(G),XR(l)
R(k);N_SPINR(k),XR(H)::QAB(G),XR(l)
B(a);OGATE,XR(C)::B(B),XB(a)
B(c);N_GUARD::R1(C),XP(f)
B(c);N_GUARD,XB(D)::R1(C),XP(f)
S(d);N_GUARD::R1(C)
S(d);CHECK,N_GUARD::R1(C),XS(d)
P(f);N_GUARD,S_CUTQ(b)::S(A),XB(c)
Tries
Try
B(B);CHECK
Vars
S(j);N_GUARD,P_SPINS(j)::B(B),XS(j)
Refutation
P(g);XB(B)
Try
R(H);CHECK,N_SPINQ(G),XR(k)
Refutation
R(l);P_PINQ(G),XR(H)
Actual
K(F);P-FLIGHT
Threat
QAB(G)
Vars
P(f);CHECK,N_GUARD,S_CUTQ(b)::S(A),XB(c)
R(k);N_SPINR(k),XR(H)::QAB(G),XR(l)
B(a);OGATE,XR(C)::B(B),XB(a)
B(c);N_GUARD,XB(D)::R1(C),XP(f)
Q(b);N_GUARD::S(A),XP(e)
R(k);::QAB(G),XR(l)
S(d);N_GUARD::R1(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).