MESON Chess Problem Database
Problem Display
PID: 71853 (3q4/B1Pb4/3NR3/1P1knP2/1R2NrQ1/1rp2n2/2P1B3/2bK4 w - - 0 1)
Triggs, D
Chess, 1952
#2
12 + 9
SOLUTION
- SOUND
- Sets
- 1...Qf6
- 2.Sxf6#
- 1...Qxc7
- 2.Sf6#
- 1...Qa8
- 2.Sf6#
- 1...Qb8
- 2.Sf6#
- 1...Qc8
- 2.Sf6#
- 1...Qe8
- 2.Sf6#
- 1...Qg8
- 2.Sf6#
- 1...Rb1
- 2.Sxc3#
- 1...Rb2
- 2.Sxc3#
- 1...Rxb4
- 2.Sxc3#
- 1...Rxe4
- 2.Qxe4#
- 1...Se1
- 2.Rd4#
- 1...Sg1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Sh2
- 2.Rd4#
- 1...Sd4
- 2.Rxd4#
- 1...Sh4
- 2.Rd4#
- 1...Sg5
- 2.Rd4#
- 1...Sc4
- 2.Bxc4#
- 1...Sxg4
- 2.Bc4#
- 1...Sc6
- 2.Bc4#
- 1...Sg6
- 2.Bc4#
- 1...Sf7
- 2.Bc4#
- 1...Qf6
- Tries
- 1.Sc8?
- threat
- 2.Sb6#
- 2.Rd6#
- 1...Qxc7
- 2.Sf6#
- 2.Se7#
- 1...Qxc8
- 2.Sf6#
- 2.Rd6#
- 1...Rxb4
- 2.Sxc3#
- 1...Rxe4
- 2.Rd6#
- 2.Qxe4#
- 1...Rxf5
- 2.Rd6#
- 1...Bxb5
- 2.Sb6#
- 1...Bxe6
- 2.Sb6#
- 1...Sxg4
- 2.Sb6#
- 2.Bc4#
- 1...Sd4
- 2.Rxd4#
- 1...Qf6
- 2.Sxf6#
- 2.Sb6#
- 1...Qe7
- 2.Sb6#
- 2.Sxe7#
- 1...Qf8
- 2.Sb6#
- 1...Be3
- 2.Rd6#
- 1...Bc6
- 2.Sb6#
- 1...Be8
- 2.Sb6#
- 1...Sd3
- 2.Sb6#
- 1...Sc4
- 2.Bxc4#
- 1...Sc6
- 2.Sb6#
- 2.Bc4#
- 1...Sg6
- 2.Sb6#
- 2.Bc4#
- 1...Sf7
- 2.Sb6#
- 2.Bc4#
- 1...Bxc8!
- threat
- 1.Rxe5+?
- 1...Sxe5
- 2.Rd4#
- 1...Kxe5!
- 1...Sxe5
- 1.Qxf3?
- threat
- 2.Sxc3#
- 2.Sf6#
- 2.Rd4#
- 1...Rxb4
- 2.Sxc3#
- 2.Sf6#
- 1...Rxf3
- 2.Rd4#
- 1...Rxe4
- 2.Rd4#
- 2.Qxe4#
- 1...Bxb5
- 2.Sxc3#
- 2.Sf6#
- 1...Bxe6
- 2.Rd4#
- 1...Sxf3
- 2.Bc4#
- 1...Qf6
- 2.Sxc3#
- 2.Sxf6#
- 2.Rd4#
- 1...Be3
- 2.Sxc3#
- 2.Sf6#
- 1...Sc4
- 2.Sxc3#
- 2.Sf6#
- 2.Bxc4#
- 2.Qd3#
- 1...Sc6
- 2.Sxc3#
- 2.Sf6#
- 2.Bc4#
- 1...Rxf5!
- threat
- 1.Sc8?
- Keys
- 1.Sc4!
- threat
- 2.Sb6#
- 1...Kxe4
- 2.Bxf3#
- 1...Qxc7
- 2.Sf6#
- 1...Rxb4
- 2.Sxc3#
- 1...Rxe4
- 2.Rd6#
- 1...Rxf5
- 2.Rd6#
- 1...Sxc4
- 2.Bxc4#
- 1...Qb8
- 2.Sf6#
- 1...Be3
- 2.Sxe3#
- 1...Sd4
- 2.Rxe5#
- threat
- 1.Sc4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 3
- REMOVED MATES = 17
- Sets
- Q(i);N_GUARD::S(E),XQ(i)
- Q(i);N_GUARD,XP(L)::S(E)
- Q(i);N_GUARD::S(E)
- R(b);N_GUARD::S(E),XP(c)
- R(b);N_GUARD,XR(D)::S(E),XP(c)
- R(e);OGATE,XS(E)::QAB1(F),XR(e)
- S(d);N_GUARD::R1(D)
- S(d);N_GUARD::R1(D),XS(d)
- S(g);N_GUARD::B(C),XS(g)
- S(g);N_GUARD,XQ(F)::B(C)
- S(g);N_GUARD::B(C)
- Tries
- Try
- S(I);
- Threat
- DUALS(2)
- Vars
- R(b);N_GUARD,XR(D)::S(E),XP(c)
- R(e);XP(H)::R1(J)
- B(h);XP(G)::S(I)
- B(h);XR(J)::S(I)
- S(d);N_GUARD::R1(D),XS(d)
- Q(i);::S(I)
- B(a);::R1(J)
- B(h);::S(I)
- S(g);::S(I)
- S(g);N_GUARD::B(C),XS(g)
- Refutation
- B(h);XS(I)
- Try
- R(J);CHECK,XS(g)
- Vars
- S(d);SBLOCK,XR(J)::R1(D)
- Refutation
- K(f);P-FLIGHT,XR(J)
- Try
- Q(F);XS(d)
- Threat
- DUALS(3)
- Vars
- R(e);XQ(F)::R1(D)
- B(h);XR(J)::R1(D)
- S(g);N_GUARD,XQ(F)::B(C)
- Refutation
- R(e);XP(H)
- Try
- Actual
- S(I);
- Threat
- S(I)
- Vars
- K(f);OGATEB,P_SPINR(e),P_SPINS(g),S_FLIGHT,XS(E)::B(C),XS(d)
- Q(i);N_GUARD,XP(L)::S(E)
- R(b);N_GUARD,XR(D)::S(E),XP(c)
- R(e);XS(E)::R1(J)
- R(e);XP(H)::R1(J)
- S(g);OGATE,XS(I)::B(C),XS(g)
- Q(i);N_GUARD::S(E)
- B(a);N_GUARD::S(I),XB(a)
- S(d);N_GUARD::R1(J),XS(g)
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).