PID: 144885 (8/5N2/3R2pQ/1Bk2q2/P7/3p4/1Rr2NnB/K7 w - - 0 1)
Burt, PCS
Chess, 1955
#2
9 + 6
SOLUTION
SOUND
Sets
1...Qh3
2.Se4#
1...Qe4
2.Sxe4#
1...Qg4
2.Sxd3#
1...Qe6
2.Sxd3#
1...Qd7
2.Sxd3#
2.Se4#
1...Qc8
2.Sxd3#
2.Se4#
1...Qf4
2.Sxd3#
1...Qe5
2.Sxd3#
1...Qg5
2.Sxd3#
2.Se4#
2.Qxg5#
1...Qh5
2.Sxd3#
2.Se4#
1...Qf6
2.Sxd3#
2.Se4#
1...Qxf7
2.Sxd3#
2.Se4#
1...Rc1+
2.Qxc1#
1...Se1
2.Qe3#
1...Se3
2.Qxe3#
1...Sh4
2.Qe3#
Tries
1.Qf4?
threat
2.Qb4#
2.Qd4#
1...Rc1+
2.Qxc1#
1...Qxf4
2.Sxd3#
1...Rxb2
2.Qc4#
2.Qd4#
1...Qe4
2.Sxe4#
1...Qg4
2.Sxd3#
2.Se4#
2.Qe5#
1...Qd5
2.Qb4#
1...Qe5
2.Sxd3#
2.Qxe5#
2.Qb4#
1...Qf6
2.Sxd3#
2.Se4#
2.Qb4#
1...Rc4
2.Qxc4#
1...Sxf4!
1.Qg5?
threat
2.Sxd3#
2.Se4#
1...Rc1+
2.Qxc1#
1...Rxb2
2.Sxd3#
1...Qd5
2.Qxd5#
1...Rd2
2.Se4#
1...Re2
2.Sxd3#
1...Rc3
2.Se4#
1...Rc4
2.Sxd3#
1...Se1
2.Se4#
2.Qe3#
1...Sf4
2.Se4#
1...d2
2.Sd3#
2.Se4#
1...Rxf2!
Keys
1.Bg1!
threat
2.Sxd3#
2.Se4#
1...Rc1+
2.Qxc1#
1...Qxf2
2.Qg5#
1...Qxf7
2.Se4#
1...Rxb2
2.Sxd3#
1...Rxf2
2.Qc1#
1...Qe4
2.Sxd3#
2.Sxe4#
1...Se3
2.Qxe3#
1...d2
2.Sd3#
2.Se4#
FEATURES
Static
TYPE = THREAT
CHANGED MATES = 0
ADDED MATES = 4
REMOVED MATES = 8
Sets
Q(e);N_GUARD::S(C)
Q(e);N_GUARD::S(C),XQ(e)
Q(e);N_GUARD::S(C),XP(c)
Q(e);N_GUARD,P_PINR(B)::S(C),XP(c)
R(a);CHECK,OGATEB::QAR(H),XR(a)
S(b);N_GUARD::QAB(H)
S(b);N_GUARD::QAB(H),XS(b)
Tries
Try
Q(H);
Threat
DUALS(2)
Vars
R(a);CHECK,OGATEB::QAR(H),XR(a)
Q(e);N_GUARD,XQ(H)::S(C),XP(c)
Q(e);N_GUARD::S(C),XQ(e)
Q(e);::QAB1(H)
R(a);N_GUARD::QAR1(H),XR(a)
Refutation
S(b);XQ(H)
Try
Q(H);P_PINQ(e)
Threat
DUALS(2)
Vars
R(a);CHECK,OGATEB::QAR(H),XR(a)
R(a);XR(B)::S(C),XP(c)
Q(e);OGATE::QAR1(H),XQ(e)
R(a);::S(C)
R(a);::S(C),XP(c)
S(b);::S(C)
Refutation
R(a);XS(C)
Actual
B(D);
Threat
DUALS(2)
Vars
R(a);CHECK,OGATEB::QAR(H),XR(a)
Q(e);OGATEB,P_SPINQ(e),XS(C)::QAR(H)
Q(e);XS(I)::B(D)+S(C),DCHECK
R(a);XR(B)::B(D)+S(C),DCHECK,XP(c)
R(a);OGATEB,P_SPINR(a),XS(C)::QAR(H)
S(b);N_GUARD::QAB(H),XS(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).