MESON Chess Problem Database
Problem Display
PID: 197955 (8/8/3nN1Qp/7p/7B/pn2Pk1K/R4P2/5Nbb w - - 0 1)
Barclay, William L
The Problemist, 1981
#2
8 + 8
SOLUTION
- SOUND
- Sets
- 1...Bxf2
- 2.Rxf2#
- 1...Bh2
- 2.Sxh2#
- 1...Bg2+
- 2.Qxg2#
- 1...Sa1
- 2.Sd4#
- 1...Sc1
- 2.Sd4#
- 1...Sd2
- 2.Sd4#
- 1...Sd4
- 2.Sxd4#
- 1...Sa5
- 2.Sd4#
- 1...Sc5
- 2.Sd4#
- 1...Sc4
- 2.Qf5#
- 1...Se4
- 2.Qf5#
- 2.Qxh5#
- 1...Sb5
- 2.Qf5#
- 1...Sf5
- 2.Qxf5#
- 1...Sb7
- 2.Qf5#
- 1...Sf7
- 2.Qf5#
- 1...Sc8
- 2.Qf5#
- 1...Se8
- 2.Qf5#
- 1...Bxf2
- Tries
- 1.Sd2+?
- 1...Sxd2
- 2.Sd4#
- 1...Ke2!
- 1...Sxd2
- 1.Sc5?
- threat
- 2.Qxh5#
- 2.Qg3#
- 1...Bg2+
- 2.Qxg2#
- 1...Bxf2
- 2.Rxf2#
- 2.Qxh5#
- 1...Sd2
- 2.Qxh5#
- 1...Bh2
- 2.Sxh2#
- 2.Qxh5#
- 1...Se4
- 2.Qxe4#
- 2.Qf5#
- 2.Qxh5#
- 1...Sf5
- 2.Qxf5#
- 2.Qxh5#
- 2.Qc6#
- 1...Sxc5!
- threat
- 1.Bg3?
- 1...Bxf2
- 2.Rxf2#
- 1...Sd2
- 2.Sd4#
- 1...Sf5
- 2.Qxf5#
- 1...Sa1
- 2.Sd4#
- 1...Bh2
- 2.Sxh2#
- 1...Sc1
- 2.Sd4#
- 1...Sd4
- 2.Sxd4#
- 1...Sa5
- 2.Sd4#
- 1...Sc5
- 2.Sd4#
- 1...Sc4
- 2.Qf5#
- 1...Se4
- 2.Qf5#
- 2.Qxh5#
- 1...Sb5
- 2.Qf5#
- 1...Sb7
- 2.Qf5#
- 1...Sf7
- 2.Qf5#
- 1...Sc8
- 2.Qf5#
- 1...Se8
- 2.Qf5#
- 1...h4
- 2.Qg4#
- 1...Bg2+!
- 1...Bxf2
- 1.Rc2?
- 1...Bg2+
- 2.Qxg2#
- 1...Bxf2
- 2.Rxf2#
- 1...Sd2
- 2.Sd4#
- 1...Sf5
- 2.Qxf5#
- 1...Sa1
- 2.Sd4#
- 1...Bh2
- 2.Sxh2#
- 1...Sc1
- 2.Sd4#
- 1...Sd4
- 2.Sxd4#
- 1...Sa5
- 2.Sd4#
- 1...Sc5
- 2.Sd4#
- 1...Sc4
- 2.Qf5#
- 1...Se4
- 2.Qf5#
- 2.Qxh5#
- 1...Sb5
- 2.Qf5#
- 1...Sb7
- 2.Qf5#
- 1...Sf7
- 2.Qf5#
- 1...Sc8
- 2.Qf5#
- 1...Se8
- 2.Qf5#
- 1...a2!
- 1...Bg2+
- 1.Rd2?
- 1...Bg2+
- 2.Qxg2#
- 1...Bxf2
- 2.Rxf2#
- 1...Sxd2
- 2.Sd4#
- 1...Sf5
- 2.Qxf5#
- 1...Sa1
- 2.Sd4#
- 1...Bh2
- 2.Sxh2#
- 1...Sc1
- 2.Sd4#
- 1...Sd4
- 2.Sxd4#
- 1...Sa5
- 2.Sd4#
- 1...Sc5
- 2.Sd4#
- 1...Sc4
- 2.Qf5#
- 1...Se4
- 2.Qf5#
- 2.Qxh5#
- 1...Sb5
- 2.Qf5#
- 1...Sb7
- 2.Qf5#
- 1...Sf7
- 2.Qf5#
- 1...Sc8
- 2.Qf5#
- 1...Se8
- 2.Qf5#
- 1...a2!
- 1...Bg2+
- 1.Qb1?
- 1...Bxf2
- 2.Rxf2#
- 1...Sd2
- 2.Sd4#
- 1...Sa1
- 2.Sd4#
- 1...Bh2
- 2.Sxh2#
- 1...Sc1
- 2.Sd4#
- 1...Sd4
- 2.Sxd4#
- 1...Sa5
- 2.Sd4#
- 1...Sc5
- 2.Sd4#
- 1...Sc4
- 2.Qf5#
- 1...Se4
- 2.Qd1#
- 1...Sb5
- 2.Qf5#
- 1...Sf5
- 2.Qxf5#
- 1...Sb7
- 2.Qf5#
- 1...Sf7
- 2.Qf5#
- 1...Sc8
- 2.Qf5#
- 1...Se8
- 2.Qf5#
- 1...Bg2+!
- 1...Bxf2
- 1.Qd3?
- threat
- 2.e4#
- 1...Bxf2
- 2.Sh2#
- 2.Rxf2#
- 1...Sc1
- 2.Sd2#
- 2.Sd4#
- 1...Sc5
- 2.Sd2#
- 2.Sd4#
- 1...Sc4
- 2.Qf5#
- 2.Qd5#
- 1...Se4
- 2.Qe2#
- 2.Qd1#
- 1...Sf5
- 2.Qxf5#
- 2.Qd5#
- 1...Bg2+!
- threat
- 1.Qh7?
- 1...Bxf2
- 2.Rxf2#
- 1...Sd2
- 2.Sd4#
- 1...Sf5
- 2.Qxf5#
- 2.Qb7#
- 1...Sa1
- 2.Sd4#
- 1...Bh2
- 2.Sxh2#
- 1...Sc1
- 2.Sd4#
- 1...Sd4
- 2.Sxd4#
- 1...Sa5
- 2.Sd4#
- 1...Sc5
- 2.Sd4#
- 1...Sc4
- 2.Qf5#
- 2.Qb7#
- 1...Se4
- 2.Qf5#
- 1...Sb5
- 2.Qf5#
- 2.Qb7#
- 1...Sb7
- 2.Qf5#
- 2.Qxb7#
- 1...Sf7
- 2.Qf5#
- 1...Sc8
- 2.Qf5#
- 2.Qb7#
- 1...Se8
- 2.Qf5#
- 2.Qb7#
- 1...Bg2+!
- 1...Bxf2
- 1.Qf6+?
- 1...Sf5
- 2.Qxf5#
- 1...Ke4!
- 1...Sf5
- 1.Sd2+?
- Keys
- 1.Sf4!
- 1...Bg2+
- 2.Qxg2#
- 1...Bxf2
- 2.Rxf2#
- 1...Sf5
- 2.Qc6#
- 1...Bh2
- 2.Sxh2#
- 1...Sa1
- 2.Sd2#
- 1...Sc1
- 2.Sd2#
- 1...Sd2
- 2.Sxd2#
- 1...Sd4
- 2.Sd2#
- 1...Sa5
- 2.Sd2#
- 1...Sc5
- 2.Sd2#
- 1...Sc4
- 2.Qc6#
- 1...Se4
- 2.Qxh5#
- 1...Sb5
- 2.Qc6#
- 1...Sb7
- 2.Qc6#
- 1...Sf7
- 2.Qc6#
- 1...Sc8
- 2.Qc6#
- 1...Se8
- 2.Qc6#
- 1...Bg2+
- 1.Sf4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 13
- ADDED MATES = 1
- REMOVED MATES = 0
- Sets
- B(a);OGATE,XP(C)::R1(B),XB(a)
- B(a);N_GUARD::S(A),XB(a)
- B(b);CHECK,N_GUARD::QAB1(H),XB(b)
- S(d);N_GUARD::S(G)
- S(d);N_GUARD::S(G),XS(d)
- S(g);N_GUARD::QAR2(H)
- S(g);N_GUARD::QAR2(H),XS(g)
- Tries
- Try
- S(A);CHECK
- Vars
- S(d);XS(A)::S(G)
- Refutation
- K(e);S_FLIGHT
- Try
- S(G);
- Threat
- DUALS(2)
- Vars
- B(b);CHECK,N_GUARD::QAB1(H),XB(b)
- S(d);::QAB(H),XP(f)
- Refutation
- S(d);XS(G)
- Try
- B(F);
- Vars
- B(a);OGATE,XP(C)::R1(B),XB(a)
- S(d);N_GUARD::S(G)
- S(g);N_GUARD::QAR2(H),XS(g)
- B(a);N_GUARD::S(A),XB(a)
- S(d);N_GUARD::S(G),XS(d)
- S(g);N_GUARD::QAR2(H)
- P(f);N_GUARD::QAB1(H)
- Refutation
- B(b);CHECK
- Try
- R(B);
- Vars
- B(b);CHECK,N_GUARD::QAB1(H),XB(b)
- B(a);OGATE,XP(C)::R1(B),XB(a)
- S(d);N_GUARD::S(G)
- S(g);N_GUARD::QAR2(H),XS(g)
- B(a);N_GUARD::S(A),XB(a)
- S(d);N_GUARD::S(G),XS(d)
- S(g);N_GUARD::QAR2(H)
- Refutation
- P(c);
- Try
- R(B);
- Vars
- B(b);CHECK,N_GUARD::QAB1(H),XB(b)
- B(a);OGATE,XP(C)::R1(B),XB(a)
- S(d);N_GUARD,XR(B)::S(G)
- S(g);N_GUARD::QAR2(H),XS(g)
- S(d);N_GUARD::S(G)
- B(a);N_GUARD::S(A),XB(a)
- S(d);N_GUARD::S(G),XS(d)
- S(g);N_GUARD::QAR2(H)
- Refutation
- P(c);
- Try
- Q(H);
- Vars
- B(a);OGATE,XP(C)::R1(B),XB(a)
- S(d);N_GUARD::S(G)
- B(a);N_GUARD::S(A),XB(a)
- S(d);N_GUARD::S(G),XS(d)
- S(g);N_GUARD::QAR2(H)
- S(g);SBLOCK::QAB(H)
- S(g);N_GUARD::QAR2(H),XS(g)
- Refutation
- B(b);CHECK
- Try
- Q(H);
- Threat
- QAR(H)+P(D)
- Refutation
- B(b);CHECK
- Try
- Q(H);
- Vars
- B(a);OGATE,XP(C)::R1(B),XB(a)
- S(d);N_GUARD::S(G)
- B(a);N_GUARD::S(A),XB(a)
- S(d);N_GUARD::S(G),XS(d)
- S(g);N_GUARD::QAR2(H)
- Refutation
- B(b);CHECK
- Try
- Q(H);CHECK
- Vars
- S(g);N_GUARD,P_SPINS(g)::QAR2(H),XS(g)
- Refutation
- K(e);S_FLIGHT
- Try
- Actual
- S(G);
- Vars
- B(b);CHECK,N_GUARD::QAB1(H),XB(b)
- B(a);OGATE,XP(C)::R1(B),XB(a)
- S(g);OGATE::QAB(H)
- B(a);N_GUARD::S(A),XB(a)
- S(d);N_GUARD::S(A)
- S(d);N_GUARD::S(A),XS(d)
- S(g);SBLOCK::QAB(H),XP(f)
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).