MESON Chess Problem Database
Problem Display
PID: 24693 (1q1r4/1p4n1/5QN1/R7/4k3/n1PN3r/K5Pb/1B4B1 w - - 0 1)
Grinblat, Arieh
Retter, Yosef
The Problemist, 2000
#2
9 + 8
SOLUTION
- SOUND
- Sets
- 1...Rhxd3
- 2.Qf3#
- 1...Re3
- 2.Sf2#
- 1...Rf3
- 2.Qxf3#
- 2.gxf3#
- 1...Rh4
- 2.Qf3#
- 1...Rh5
- 2.Qf3#
- 1...Rh6
- 2.Qf3#
- 1...Rh7
- 2.Qf3#
- 1...Rhh8
- 2.Qf3#
- 1...Rdxd3
- 2.Qd4#
- 1...Rd4
- 2.Qxd4#
- 1...Rd5
- 2.Sc5#
- 1...Rc8
- 2.Qd4#
- 1...Re8
- 2.Qd4#
- 1...Rf8
- 2.Qd4#
- 1...Rg8
- 2.Qd4#
- 1...Rdh8
- 2.Qd4#
- 1...Bg3
- 2.Qf3#
- 1...Bd6
- 2.Qd4#
- 1...Sf5
- 2.Qxf5#
- 1...Sh5
- 2.Qf5#
- 1...Se6
- 2.Qf5#
- 1...Se8
- 2.Qf5#
- 1...Rhxd3
- Tries
- 1.Se7?
- threat
- 2.Sc5#
- 1...Rhxd3
- 2.Qf3#
- 1...Rdxd3
- 2.Qd4#
- 1...Sf5
- 2.Qxf5#
- 1...Bxg1!
- threat
- 1.Bb6?
- threat
- 2.Sf2#
- 1...Rhxd3
- 2.Qf3#
- 1...Rdxd3
- 2.Qd4#
- 1...Rd4
- 2.Qxd4#
- 1...Sb5!
- threat
- 1.Ra4+?
- 1...Kd5
- 2.Se7#
- 2.Rd4#
- 1...Rd4
- 2.Rxd4#
- 1...Sc4!
- 1...Kd5
- 1.Qb6?
- threat
- 2.Sf2#
- 1...Rhxd3
- 2.Qe3#
- 1...Rdxd3
- 2.Qd4#
- 1...Rd4
- 2.Qxd4#
- 1...Sb5!
- threat
- 1.Qc6+?
- 1...Rd5
- 2.Sc5#
- 2.Qxd5#
- 1...bxc6!
- 1...Rd5
- 1.Qe6+?
- 1...Qe5
- 2.Sc5#
- 1...Be5
- 2.Sc5#
- 1...Sxe6!
- 1...Qe5
- 1.Qf7?
- threat
- 2.Sc5#
- 1...Rhxd3
- 2.Qf3#
- 1...Rdxd3
- 2.Qd5#
- 1...Se6
- 2.Qf5#
- 1...Bxg1!
- threat
- 1.Se7?
- Keys
- 1.Qg5!
- threat
- 2.Sf2#
- 2.Sc5#
- 1...Rhxd3
- 2.Qe3#
- 1...Rdxd3
- 2.Qd5#
- 1...Qf4
- 2.Sc5#
- 1...Qe5
- 2.Sf2#
- 1...Bf4
- 2.Sc5#
- 1...Be5
- 2.Sf2#
- 1...Sf5
- 2.Sf2#
- 2.Qxf5#
- threat
- 1.Qg5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 4
- REMOVED MATES = 19
- Sets
- R(c);N_GUARD,P_SPINR(c),XS(F)::QAB1(H)
- R(c);SBLOCK::B(A)+S(F),DCHECK
- R(c);N_GUARD::QAB1(H)
- R(h);N_GUARD,P_SPINR(h),XS(F)::QAR1(H)
- R(h);N_GUARD::QAR1(H),XR(h)
- R(h);SBLOCK::B(A)+S(F),DCHECK
- R(h);N_GUARD::QAR1(H)
- B(a);S_CUTR(c)::QAB1(H)
- B(a);S_CUTR(h)::QAR1(H)
- S(f);N_GUARD::QAB1(H),XS(f)
- S(f);N_GUARD::QAB1(H)
- Tries
- Try
- S(I);
- Threat
- B(A)+S(F),DCHECK
- Vars
- R(c);N_GUARD,P_SPINR(c),XS(F)::QAB1(H)
- R(h);N_GUARD,P_SPINR(h),XS(F)::QAR1(H)
- S(f);N_GUARD::QAB1(H),XS(f)
- Refutation
- B(a);XB(B)
- Try
- B(B);
- Threat
- B(A)+S(F),DCHECK
- Vars
- R(c);N_GUARD,P_SPINR(c),XS(F)::QAB1(H)
- R(h);N_GUARD,P_SPINR(h),XS(F)::QAR1(H)
- R(h);N_GUARD::QAR1(H),XR(h)
- Refutation
- S(b);
- Try
- R(G);CHECK
- Vars
- R(h);N_GUARD,P_SPINR(h)::R1(G),XR(h)
- Refutation
- S(b);P_SPINS(b)
- Try
- Q(H);
- Threat
- B(A)+S(F),DCHECK
- Vars
- R(c);N_GUARD,P_SPINR(c),XS(F)::QAR1(H)
- R(h);N_GUARD,P_SPINR(h),XS(F)::QAR1(H)
- R(h);N_GUARD::QAR1(H),XR(h)
- Refutation
- S(b);
- Try
- Q(H);CHECK
- Refutation
- P(e);XQ(H)
- Try
- Q(H);CHECK
- Vars
- Q(g);P_SPINQ(g)::B(A)+S(F),DCHECK
- B(a);P_SPINB(a)::B(A)+S(F),DCHECK
- Refutation
- S(f);XQ(H)
- Try
- Q(H);
- Threat
- B(A)+S(F),DCHECK
- Vars
- R(c);N_GUARD,P_SPINR(c),XS(F)::QAB1(H)
- R(h);N_GUARD,P_SPINR(h),XS(F)::QAB1(H)
- S(f);N_GUARD::QAB1(H)
- Refutation
- B(a);XB(B)
- Try
- Actual
- Q(H);
- Threat
- DUALS(2)
- Vars
- R(c);N_GUARD,P_SPINR(c),XS(F)::QAR1(H)
- R(h);N_GUARD,P_SPINR(h),XS(F)::QAB1(H)
- Q(g);::B(A)+S(F),DCHECK
- B(a);::B(A)+S(F),DCHECK
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).