MESON Chess Problem Database
Problem Display
PID: 175469 (5b1K/5Q1p/5N2/3n1Nk1/6p1/4P1p1/2BB4/7q w - - 0 1)
McAllister, George W
Philadelphia Times, 1899
#2
7 + 7
| 6490 | yacpdb | 2018 |
SOLUTION
- SOUND
- Sets
- 1...Qg2
- 2.Sxh7#
- 1...Qf3
- 2.Sxh7#
- 1...Qe4
- 2.Sxe4#
- 2.Sxh7#
- 1...Qb1
- 2.Se4#
- 2.Sxh7#
- 1...Qc1
- 2.Se4#
- 2.Sxh7#
- 1...Qd1
- 2.Se4#
- 2.Sxh7#
- 1...Qe1
- 2.Se4#
- 2.Sxh7#
- 1...Qf1
- 2.Se4#
- 2.Sxh7#
- 1...Qg1
- 2.Se4#
- 2.Sxh7#
- 1...Qh2
- 2.Se4#
- 1...Qh3
- 2.Se4#
- 1...Qh4
- 2.Se4#
- 1...Qh5
- 2.Se4#
- 1...Qh6
- 2.Se4#
- 1...Ba3
- 2.Qg7#
- 1...Bb4
- 2.Qg7#
- 1...Bc5
- 2.Qg7#
- 1...Bd6
- 2.Qg7#
- 1...Bh6
- 2.Sxh7#
- 1...Be7
- 2.Qg7#
- 1...Bg7+
- 2.Qxg7#
- 1...Sc3
- 2.e4#
- 1...Sxe3
- 2.Bxe3#
- 1...Sb4
- 2.e4#
- 1...Sf4
- 2.exf4#
- 1...Sb6
- 2.e4#
- 1...Sxf6
- 2.e4#
- 1...Sc7
- 2.e4#
- 1...Se7
- 2.e4#
- 1...g2
- 2.Se4#
- 1...h5
- 2.Sh7#
- 1...h6
- 2.Sh7#
- 1...Qg2
- Tries
- 1.Bd3?
- 1...Bg7+
- 2.Qxg7#
- 1...Sxe3
- 2.Bxe3#
- 1...Sxf6
- 2.e4#
- 1...Qe4
- 2.Sxe4#
- 2.Sxh7#
- 1...Qg2
- 2.Sxh7#
- 1...Qf3
- 2.Sxh7#
- 1...Qb1
- 2.Se4#
- 2.Sxh7#
- 1...Qc1
- 2.Se4#
- 2.Sxh7#
- 1...Qd1
- 2.Se4#
- 2.Sxh7#
- 1...Qe1
- 2.Se4#
- 2.Sxh7#
- 1...Qf1
- 2.Se4#
- 2.Sxh7#
- 1...Qg1
- 2.Se4#
- 2.Sxh7#
- 1...Qh2
- 2.Se4#
- 1...Qh3
- 2.Se4#
- 1...Qh4
- 2.Se4#
- 1...Qh5
- 2.Se4#
- 1...Qh6
- 2.Se4#
- 1...Ba3
- 2.Qg7#
- 1...Bb4
- 2.Qg7#
- 1...Bc5
- 2.Qg7#
- 1...Bd6
- 2.Qg7#
- 1...Bh6
- 2.Sxh7#
- 1...Be7
- 2.Qg7#
- 1...Sc3
- 2.e4#
- 1...Sb4
- 2.e4#
- 1...Sf4
- 2.exf4#
- 1...Sb6
- 2.e4#
- 1...Sc7
- 2.e4#
- 1...Se7
- 2.e4#
- 1...g2
- 2.Se4#
- 1...h5
- 2.Sh7#
- 1...h6
- 2.Sh7#
- 1...Qa1!
- 1...Bg7+
- 1.Qg8+?
- 1...Bg7+
- 2.Qxg7#
- 1...Kxf6!
- 1...Bg7+
- 1.e4+?
- 1...Se3
- 2.Bxe3#
- 1...Sf4!
- 1...Se3
- 1.Bd3?
- Keys
- 1.Bb1!
- 1...Bg7+
- 2.Qxg7#
- 1...Qxb1
- 2.Sxh7#
- 1...Sxe3
- 2.Bxe3#
- 1...Sxf6
- 2.e4#
- 1...Qe4
- 2.Sxe4#
- 2.Sxh7#
- 1...Qg2
- 2.Sxh7#
- 1...Qf3
- 2.Sxh7#
- 1...Qc1
- 2.Se4#
- 2.Sxh7#
- 1...Qd1
- 2.Se4#
- 2.Sxh7#
- 1...Qe1
- 2.Se4#
- 2.Sxh7#
- 1...Qf1
- 2.Se4#
- 2.Sxh7#
- 1...Qg1
- 2.Se4#
- 2.Sxh7#
- 1...Qh2
- 2.Se4#
- 1...Qh3
- 2.Se4#
- 1...Qh4
- 2.Se4#
- 1...Qh5
- 2.Se4#
- 1...Qh6
- 2.Se4#
- 1...Ba3
- 2.Qg7#
- 1...Bb4
- 2.Qg7#
- 1...Bc5
- 2.Qg7#
- 1...Bd6
- 2.Qg7#
- 1...Bh6
- 2.Sxh7#
- 1...Be7
- 2.Qg7#
- 1...Sc3
- 2.e4#
- 1...Sb4
- 2.e4#
- 1...Sf4
- 2.exf4#
- 1...Sb6
- 2.e4#
- 1...Sc7
- 2.e4#
- 1...Se7
- 2.e4#
- 1...g2
- 2.Se4#
- 1...h5
- 2.Sh7#
- 1...h6
- 2.Sh7#
- 1...Bg7+
- 1.Bb1!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 0
- Sets
- Q(a);N_GUARD::S(E),XP(f)
- Q(a);N_GUARD::S(E)
- B(g);N_GUARD::QAR2(F)
- B(g);S_CUTQ(a)::S(E),XP(f)
- B(g);CHECK,N_GUARD::QAR2(F),XB(g)
- S(d);N_GUARD::B(B)+P(C)
- S(d);OGATE,P_SPINS(d),XP(C)::B(B),XS(d)
- S(d);OGATE::P(C),XS(d)
- S(d);N_GUARD,XS(E)::B(B)+P(C)
- P(b);S_CUTQ(a)::S(E)
- P(f);S_CUTQ(a)::S(E)
- Tries
- Try
- B(A);
- Vars
- B(g);CHECK,N_GUARD::QAR2(F),XB(g)
- S(d);OGATE,P_SPINS(d),XP(C)::B(B),XS(d)
- S(d);N_GUARD,XS(E)::B(B)+P(C)
- Q(a);N_GUARD::S(E),XP(f)
- Q(a);N_GUARD::S(E)
- B(g);N_GUARD::QAR2(F)
- B(g);S_CUTQ(a)::S(E),XP(f)
- S(d);N_GUARD::B(B)+P(C)
- S(d);OGATE::P(C),XS(d)
- P(b);S_CUTQ(a)::S(E)
- P(f);S_CUTQ(a)::S(E)
- Refutation
- Q(a);P_PINS(E)
- Try
- Q(F);CHECK
- Vars
- B(g);CHECK,N_GUARD,P_SPINB(g)::QAR2(F),XB(g)
- Refutation
- K(e);S_FLIGHT,XS(E)
- Try
- P(C);CHECK
- Vars
- S(d);N_GUARD,P_SPINS(d)::B(B),XS(d)
- Refutation
- S(d);P_SPINS(d)
- Try
- Actual
- B(A);
- Vars
- B(g);CHECK,N_GUARD::QAR2(F),XB(g)
- Q(a);N_GUARD,XB(A)::S(E),XP(f)
- S(d);OGATE,P_SPINS(d),XP(C)::B(B),XS(d)
- S(d);N_GUARD,XS(E)::B(B)+P(C)
- Q(a);N_GUARD::S(E),XP(f)
- Q(a);N_GUARD::S(E)
- B(g);N_GUARD::QAR2(F)
- B(g);S_CUTQ(a)::S(E),XP(f)
- S(d);N_GUARD::B(B)+P(C)
- S(d);OGATE::P(C),XS(d)
- P(b);S_CUTQ(a)::S(E)
- P(f);S_CUTQ(a)::S(E)
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).