MESON Chess Problem Database
Problem Display
PID: 211711 (4QB2/8/8/2pk1bNp/5R1K/8/2n5/5N2 w - - 0 1)
Lewis, Robert Tony
The Problemist, 1986
#2
6 + 5
SOLUTION
- SOUND
- Sets
- 1...Bd3
- 2.Qe6#
- 1...Bh3
- 2.Qe4#
- 1...Be4
- 2.Qxe4#
- 1...Bg4
- 2.Qe4#
- 1...Be6
- 2.Qxe6#
- 1...Bg6
- 2.Qe6#
- 1...Bd7
- 2.Qe4#
- 1...Bh7
- 2.Qe6#
- 1...Bc8
- 2.Qe4#
- 1...Sa1
- 2.Se3#
- 1...Se1
- 2.Se3#
- 1...Sa3
- 2.Se3#
- 1...Se3
- 2.Sxe3#
- 1...Sb4
- 2.Se3#
- 1...Sd4
- 2.Se3#
- 1...c4
- 2.Qb5#
- 1...Bd3
- Tries
- 1.Kg3?
- 1...Be4
- 2.Qxe4#
- 1...Be6
- 2.Qxe6#
- 1...Bd7
- 2.Qe4#
- 1...Sd4
- 2.Se3#
- 1...Bd3
- 2.Qe6#
- 1...Bh3
- 2.Qe4#
- 1...Bg4
- 2.Qe4#
- 1...Bg6
- 2.Qe6#
- 1...Bh7
- 2.Qe6#
- 1...Bc8
- 2.Qe4#
- 1...Sa1
- 2.Se3#
- 1...Se1
- 2.Se3#
- 1...Sa3
- 2.Se3#
- 1...Se3
- 2.Sxe3#
- 1...Sb4
- 2.Se3#
- 1...c4
- 2.Qb5#
- 1...h4+!
- 1...Be4
- 1.Sf7?
- 1...Be4
- 2.Qxe4#
- 1...Bd7
- 2.Qxd7#
- 2.Qe4#
- 1...Sd4
- 2.Se3#
- 1...Sa1
- 2.Se3#
- 1...Bd3
- 2.Qd7#
- 1...Bh3
- 2.Qe4#
- 1...Bg4
- 2.Qe4#
- 1...Be6
- 2.Qa8#
- 1...Bg6
- 2.Qd7#
- 1...Bh7
- 2.Qd7#
- 1...Bc8
- 2.Qe4#
- 1...Se1
- 2.Se3#
- 1...Sa3
- 2.Se3#
- 1...Se3
- 2.Sxe3#
- 1...Sb4
- 2.Se3#
- 1...c4!
- 1...Be4
- 1.Rc4?
- 1...Be6
- 2.Qxe6#
- 1...Bd7
- 2.Qe4#
- 1...Sa1
- 2.Se3#
- 1...Bd3
- 2.Qe6#
- 1...Bh3
- 2.Qe4#
- 1...Be4
- 2.Qxe4#
- 2.Qe6#
- 1...Bg4
- 2.Qe4#
- 1...Bg6
- 2.Qe6#
- 1...Bh7
- 2.Qe6#
- 1...Bc8
- 2.Qe4#
- 1...Se1
- 2.Se3#
- 1...Sa3
- 2.Se3#
- 1...Se3
- 2.Sxe3#
- 1...Sb4
- 2.Se3#
- 1...Sd4
- 2.Se3#
- 2.Rxc5#
- 1...Kxc4!
- 1...Be6
- 1.Rd4+?
- 1...Sxd4
- 2.Se3#
- 1...cxd4
- 2.Qb5#
- 1...Kxd4!
- 1...Sxd4
- 1.Re4?
- threat
- 2.Qa8#
- 1...Bxe4
- 2.Qxe4#
- 1...Bd7
- 2.Qxd7#
- 1...Sd4
- 2.Se3#
- 1...Sb4
- 2.Se3#
- 1...Bc8!
- threat
- 1.Rg4?
- 1...Bxg4
- 2.Qe4#
- 1...Be4
- 2.Qxe4#
- 1...Be6
- 2.Qxe6#
- 1...Bd7
- 2.Qe4#
- 1...Sd4
- 2.Se3#
- 1...Sa1
- 2.Se3#
- 1...Bd3
- 2.Qe6#
- 1...Bg6
- 2.Qe6#
- 1...Bh7
- 2.Qe6#
- 1...Bc8
- 2.Qe4#
- 1...Se1
- 2.Se3#
- 1...Sa3
- 2.Se3#
- 1...Se3
- 2.Sxe3#
- 1...Sb4
- 2.Se3#
- 1...c4
- 2.Qb5#
- 1...hxg4!
- 1...Bxg4
- 1.Qc6+?
- 1...Ke5
- 2.Qd6#
- 1...Kxc6!
- 1...Ke5
- 1.Qd7+?
- 1...Ke5
- 2.Rxf5#
- 2.Qxf5#
- 2.Qd6#
- 1...Bxd7!
- 1...Ke5
- 1.Qf7+?
- 1...Ke5
- 2.Qxf5#
- 1...Be6
- 2.Qxe6#
- 1...Kc6!
- 1...Ke5
- 1.Qe7?
- threat
- 2.Qxc5#
- 2.Qd6#
- 1...Be4
- 2.Qxc5#
- 2.Qxe4#
- 1...Sd4
- 2.Qxc5#
- 1...c4
- 2.Qc5#
- 2.Qd6#
- 1...Kc6!
- threat
- 1.Qc8?
- threat
- 2.Qxc5#
- 1...Ke5
- 2.Qxf5#
- 1...c4
- 2.Qc5#
- 1...Bxc8!
- threat
- 1.Kg3?
- Keys
- 1.Sf3!
- 1...Be4
- 2.Qxe4#
- 1...Bd7
- 2.Qxd7#
- 2.Qe4#
- 1...Sd4
- 2.Se3#
- 1...Sa1
- 2.Se3#
- 1...Bd3
- 2.Qd7#
- 1...Bh3
- 2.Qe4#
- 1...Bg4
- 2.Qe4#
- 1...Be6
- 2.Qa8#
- 1...Bg6
- 2.Qd7#
- 1...Bh7
- 2.Qd7#
- 1...Bc8
- 2.Qe4#
- 1...Se1
- 2.Se3#
- 1...Sa3
- 2.Se3#
- 1...Se3
- 2.Sxe3#
- 1...Sb4
- 2.Se3#
- 1...c4
- 2.Rxf5#
- 1...Be4
- 1.Sf3!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 5
- ADDED MATES = 0
- REMOVED MATES = 1
- Sets
- B(d);N_GUARD::QAB1(E)
- B(d);N_GUARD::QAB1(E),XB(d)
- S(a);N_GUARD::S(A)
- S(a);N_GUARD::S(A),XS(a)
- P(b);OGATEB::QAR2(E)
- Tries
- Try
- K(C);S_FLIGHT
- Vars
- B(d);N_GUARD::QAB1(E),XB(d)
- B(d);N_GUARD::QAB1(E)
- S(a);N_GUARD::S(A)
- S(a);N_GUARD::S(A),XS(a)
- P(b);OGATEB::QAR2(E)
- Refutation
- P(e);CHECK
- Try
- S(D);
- Vars
- B(d);N_GUARD::QAB1(E),XB(d)
- S(a);N_GUARD::S(A)
- B(d);N_GUARD::QAR2(E)
- B(d);N_GUARD::QAB1(E)
- B(d);SBLOCK::QAB(E)
- S(a);N_GUARD::S(A),XS(a)
- Refutation
- P(b);
- Try
- R(B);
- Vars
- B(d);N_GUARD::QAB1(E),XB(d)
- B(d);N_GUARD::QAB1(E)
- S(a);N_GUARD::S(A)
- S(a);N_GUARD::S(A),XS(a)
- Refutation
- K(c);S_FLIGHT,XR(B)
- Try
- R(B);CHECK
- Vars
- S(a);SBLOCK,XR(B)::S(A)
- P(b);SBLOCK,S_CUTS(a),XR(B)::QAR2(E)
- Refutation
- K(c);P-FLIGHT,XR(B)
- Try
- R(B);
- Threat
- QAB(E)
- Vars
- B(d);OGATE,XR(B)::QAB1(E),XB(d)
- B(d);N_GUARD::QAR2(E),XB(d)
- S(a);N_GUARD::S(A)
- Refutation
- B(d);
- Try
- R(B);
- Vars
- B(d);N_GUARD,XR(B)::QAB1(E)
- B(d);N_GUARD::QAB1(E),XB(d)
- B(d);N_GUARD::QAB1(E)
- S(a);N_GUARD::S(A)
- S(a);N_GUARD::S(A),XS(a)
- P(b);OGATEB::QAR2(E)
- Refutation
- P(e);XR(B)
- Try
- Q(E);CHECK
- Vars
- K(c);P-FLIGHT::QAB1(E)
- Refutation
- K(c);S_FLIGHT,XQ(E)
- Try
- Q(E);CHECK
- Refutation
- B(d);XQ(E)
- Try
- Q(E);CHECK
- Vars
- K(c);P-FLIGHT::QAR1(E),XB(d)
- B(d);N_GUARD,P_SPINB(d)::QAB1(E),XB(d)
- Refutation
- K(c);S_FLIGHT
- Try
- Q(E);
- Threat
- DUALS(2)
- Vars
- S(a);::QAR1(E),XP(b)
- Refutation
- K(c);S_FLIGHT
- Try
- Q(E);
- Threat
- QAR1(E),XP(b)
- Vars
- K(c);P-FLIGHT::QAR1(E),XB(d)
- P(b);::QAR1(E)
- Refutation
- B(d);XQ(E)
- Try
- Actual
- S(D);
- Vars
- B(d);N_GUARD::QAB1(E),XB(d)
- S(a);N_GUARD::S(A)
- B(d);N_GUARD::QAR2(E)
- B(d);N_GUARD::QAB1(E)
- B(d);SBLOCK::QAB(E)
- S(a);N_GUARD::S(A),XS(a)
- P(b);SBLOCK::R(B),XB(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).