MESON Chess Problem Database
Problem Display
PID: 68349 (8/p7/Pn1Q3B/3pNP1K/7N/2p1q3/p2k2pn/R2B2R1 w - - 0 1)
Rendall, JL
Chess, 1949
#2
10 + 9
SOLUTION
- SOUND
- Sets
- 1...Qf4
- 2.Bxf4#
- 1...Qg5+
- 2.Bxg5#
- 1...Qxh6+
- 2.Qxh6#
- 1...Sf1
- 2.Shf3#
- 1...Sf3
- 2.Shxf3#
- 1...Sg4
- 2.Shf3#
- 1...Sa4
- 2.Qxd5#
- 1...Sc4
- 2.Qxd5#
- 1...Sd7
- 2.Qxd5#
- 1...Sa8
- 2.Qxd5#
- 1...Sc8
- 2.Qxd5#
- 1...c2
- 2.Qb4#
- 1...d4
- 2.Qxd4#
- 1...Qf4
- Tries
- 1.Kg6?
- 1...Qg5+
- 2.Bxg5#
- 1...Qf4
- 2.Bxf4#
- 1...Sf1
- 2.Shf3#
- 1...c2
- 2.Qb4#
- 1...Sf3
- 2.Shxf3#
- 1...Sg4
- 2.Shf3#
- 1...Sa4
- 2.Qxd5#
- 1...Sc4
- 2.Qxd5#
- 1...Sd7
- 2.Qxd5#
- 1...Sa8
- 2.Qxd5#
- 1...Sc8
- 2.Qxd5#
- 1...d4
- 2.Qxd4#
- 1...Qxh6+!
- 1...Qg5+
- 1.Sc4+?
- 1...Sxc4
- 2.Qxd5#
- 1...Kd3!
- 1...Sxc4
- 1.Bf4?
- 1...Sf1
- 2.Shf3#
- 1...c2
- 2.Qb4#
- 1...Sf3
- 2.Shxf3#
- 1...Sg4
- 2.Shf3#
- 1...Sa4
- 2.Qxd5#
- 1...Sc4
- 2.Qxd5#
- 1...Sd7
- 2.Qxd5#
- 1...Sa8
- 2.Qxd5#
- 1...Sc8
- 2.Qxd5#
- 1...d4
- 2.Qxd4#
- 1...Qxf4!
- 1...Sf1
- 1.Bg5?
- 1...Qf4
- 2.Bxf4#
- 1...Sf1
- 2.Shf3#
- 1...c2
- 2.Qb4#
- 1...Sf3
- 2.Shxf3#
- 1...Sg4
- 2.Shf3#
- 1...Sa4
- 2.Qxd5#
- 1...Sc4
- 2.Qxd5#
- 1...Sd7
- 2.Qxd5#
- 1...Sa8
- 2.Qxd5#
- 1...Sc8
- 2.Qxd5#
- 1...d4
- 2.Qxd4#
- 1...Qxg5+!
- 1...Qf4
- 1.Rxa2+?
- 1...c2
- 2.Rxc2#
- 1...Kc1!
- 1...c2
- 1.Qa3?
- threat
- 2.Qc1#
- 1...Qg5+
- 2.Bxg5#
- 1...Sf1
- 2.Shf3#
- 1...c2
- 2.Bxe3#
- 2.Qb4#
- 2.Qd3#
- 2.Qxe3#
- 2.Qa5#
- 1...Qxh6+!
- threat
- 1.Qc5?
- threat
- 2.Bxe3#
- 2.Qxe3#
- 2.Qd4#
- 1...Qg5+
- 2.Bxg5#
- 1...Sf1
- 2.Shf3#
- 1...Qf4
- 2.Bxf4#
- 2.Qf2#
- 2.Qd4#
- 1...Sf3
- 2.Shxf3#
- 2.Bxe3#
- 2.Qxe3#
- 1...Sg4
- 2.Shf3#
- 2.Qd4#
- 1...Sc4
- 2.Qd4#
- 2.Qxd5#
- 1...d4
- 2.Qxd4#
- 1...Qxh6+!
- threat
- 1.Qxb6?
- threat
- 2.Bxe3#
- 2.Qxe3#
- 2.Qd4#
- 1...Qg5+
- 2.Bxg5#
- 1...Qxh6+
- 2.Qxh6#
- 1...Sf1
- 2.Shf3#
- 1...c2
- 2.Qxe3#
- 2.Qd4#
- 2.Qa5#
- 2.Qb4#
- 1...Qf4
- 2.Bxf4#
- 2.Qf2#
- 2.Qd4#
- 1...Sf3
- 2.Shxf3#
- 2.Bxe3#
- 2.Qxe3#
- 1...Sg4
- 2.Shf3#
- 2.Qd4#
- 1...d4
- 2.Qxd4#
- 1...axb6!
- threat
- 1.Qg6?
- threat
- 2.Qxg2#
- 1...Qg5+
- 2.Bxg5#
- 2.Qxg5#
- 1...Qxh6+
- 2.Qxh6#
- 1...Qf4
- 2.Bxf4#
- 1...Sf1
- 2.Shf3#
- 1...Sg4
- 2.Shf3#
- 1...c2!
- threat
- 1.f6?
- 1...Qg5+
- 2.Bxg5#
- 1...Qf4
- 2.Bxf4#
- 1...Sf1
- 2.Shf3#
- 1...c2
- 2.Qb4#
- 1...Sa4
- 2.Qxd5#
- 1...Sf3
- 2.Shxf3#
- 1...Sg4
- 2.Shf3#
- 1...Sc4
- 2.Qxd5#
- 1...Sd7
- 2.Qxd5#
- 1...Sa8
- 2.Qxd5#
- 1...Sc8
- 2.Qxd5#
- 1...d4
- 2.Qxd4#
- 1...Qxh6+!
- 1...Qg5+
- 1.Kg6?
- Keys
- 1.Qc6!
- 1...Qg5+
- 2.Bxg5#
- 1...Qxh6+
- 2.Qxh6#
- 1...Qf4
- 2.Bxf4#
- 1...Sf1
- 2.Shf3#
- 1...Sa4
- 2.Qxd5#
- 1...Sf3
- 2.Shxf3#
- 1...Sg4
- 2.Shf3#
- 1...Sc4
- 2.Qxd5#
- 1...Sd7
- 2.Qxd5#
- 1...Sa8
- 2.Qxd5#
- 1...Sc8
- 2.Qxd5#
- 1...c2
- 2.Qxc2#
- 1...d4
- 2.Qxg2#
- 1...Qg5+
- 1.Qc6!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 2
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- Q(f);OGATEB::B(J),XQ(f)
- Q(f);CHECK,OGATEB::B(J),XQ(f)
- Q(f);CHECK,N_SPINQ(f),OGATE,XB(J)::QAB(I),XQ(f)
- S(d);N_GUARD::S(D)
- S(d);N_GUARD::S(D),XS(d)
- S(h);N_GUARD::QAR(I),XP(g)
- P(e);OGATEB::QAB(I)
- P(g);OGATE::QAR2(I),XP(g)
- Tries
- Try
- K(G);S_FLIGHT
- Vars
- Q(f);CHECK,OGATEB::B(J),XQ(f)
- Q(f);OGATEB::B(J),XQ(f)
- S(d);N_GUARD::S(D)
- P(e);OGATEB::QAB(I)
- S(d);N_GUARD::S(D),XS(d)
- S(h);N_GUARD::QAR(I),XP(g)
- P(g);OGATE::QAR2(I),XP(g)
- Refutation
- Q(f);CHECK,N_SPINQ(f),XB(J)
- Try
- S(E);CHECK
- Vars
- S(h);XS(E)::QAR(I),XP(g)
- Refutation
- K(b);N_SPINQ(f),P-FLIGHT
- Try
- B(J);
- Vars
- S(d);N_GUARD::S(D)
- P(e);OGATEB::QAB(I)
- S(d);N_GUARD::S(D),XS(d)
- S(h);N_GUARD::QAR(I),XP(g)
- P(g);OGATE::QAR2(I),XP(g)
- Refutation
- Q(f);N_SPINQ(f),XB(J)
- Try
- B(J);
- Vars
- Q(f);OGATEB::B(J),XQ(f)
- S(d);N_GUARD::S(D)
- P(e);OGATEB::QAB(I)
- S(d);N_GUARD::S(D),XS(d)
- S(h);N_GUARD::QAR(I),XP(g)
- P(g);OGATE::QAR2(I),XP(g)
- Refutation
- Q(f);CHECK,N_SPINQ(f),XB(J)
- Try
- R(A);CHECK,XP(a)
- Vars
- P(e);N_SPINP(g),P_SPINP(e)::R1(A),XP(e)
- Refutation
- K(b);N_SPINP(g),S_FLIGHT
- Try
- Q(I);N_PINP(g)
- Threat
- QAB1(I)
- Vars
- Q(f);CHECK,OGATEB::B(J),XQ(f)
- S(d);N_GUARD::S(D)
- Refutation
- Q(f);CHECK,N_SPINQ(f),XB(J)
- Try
- Q(I);N_PINP(g)
- Threat
- DUALS(3)
- Vars
- Q(f);CHECK,OGATEB::B(J),XQ(f)
- S(d);N_GUARD::S(D)
- P(g);::QAR2(I),XP(g)
- Refutation
- Q(f);CHECK,N_SPINQ(f),XB(J)
- Try
- Q(I);N_PINP(g),XS(h)
- Threat
- DUALS(3)
- Vars
- Q(f);CHECK,OGATEB::B(J),XQ(f)
- Q(f);CHECK,N_SPINQ(f),OGATE,XB(J)::QAB(I),XQ(f)
- S(d);N_GUARD::S(D)
- P(g);::QAR2(I),XP(g)
- Refutation
- P(i);XQ(I)
- Try
- Q(I);N_PINP(g)
- Threat
- QAR(I),XP(c)
- Vars
- Q(f);CHECK,N_SPINQ(f),OGATE,XB(J)::QAB(I),XQ(f)
- Q(f);OGATEB::B(J),XQ(f)
- S(d);N_GUARD::S(D)
- Refutation
- P(e);
- Try
- P(F);
- Vars
- Q(f);CHECK,OGATEB::B(J),XQ(f)
- Q(f);OGATEB::B(J),XQ(f)
- S(d);N_GUARD::S(D)
- P(e);OGATEB::QAB(I)
- S(h);N_GUARD::QAR(I),XP(g)
- S(d);N_GUARD::S(D),XS(d)
- P(g);OGATE::QAR2(I),XP(g)
- Refutation
- Q(f);CHECK,N_SPINQ(f),XB(J)
- Try
- Actual
- Q(I);N_PINP(g)
- Vars
- Q(f);CHECK,OGATEB::B(J),XQ(f)
- Q(f);CHECK,N_SPINQ(f),OGATE,XB(J)::QAB(I),XQ(f)
- Q(f);OGATEB::B(J),XQ(f)
- S(d);N_GUARD::S(D)
- S(h);N_GUARD::QAR(I),XP(g)
- S(d);N_GUARD::S(D),XS(d)
- P(e);OGATE::QAR1(I),XP(e)
- P(g);OGATE::QAR(I),XP(c)
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).