MESON Chess Problem Database

Problem Display
PID: 173046 (br1R2qb/2B1p2n/R2NN1B1/2pk2p1/1P6/7p/7Q/7K w - - 0 1)

Jurka, Eriks

1st Comm., Latvian Ty., 1950

br1R2qb/2B1p2n/R2NN1B1/2pk2p1/1P6/7p/7Q/7K

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe6+
      • 2.Sb7#
  • Tries
    • 1.Sc4+?
      • 1...Qxd8
        • 2.Se3#
      • 1...Rxd8
        • 2.Se3#
      • 1...Kxc4+!
    • 1.Sf5+?
      • 1...Ke4
        • 2.Qe2#
      • 1...Qxd8
        • 2.Se3#
      • 1...Rxd8
        • 2.Se3#
      • 1...Kc4+!
    • 1.Qe5+?
      • 1...Kxe5+
        • 2.Se4#
      • 1...Bxe5!
    • 1.Qa2+?
      • 1...Ke5+
        • 2.Se4#
      • 1...c4!
    • 1.Qd2+?
      • 1...Ke5+
        • 2.Se4#
      • 1...Kxe6+
        • 2.Sb7#
      • 1...Bd4!
    • 1.Qg2+?
      • 1...Ke5
        • 2.Se4#
        • 2.Se8#
      • 1...Kxe6
        • 2.Sb7#
      • 1...hxg2+!
  • Keys
    • 1.Qc2!
      • threat
        • 2.Qe4#
      • 1...Ke5+
        • 2.Se4#
      • 1...Kxe6+
        • 2.Sb7#
      • 1...Qxe6
        • 2.Qxc5#
      • 1...Qxg6
        • 2.Sc8#
      • 1...Rxb4
        • 2.Se8#
      • 1...Be5
        • 2.Qc4#
      • 1...Sf6
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • K(c);CHECK,S_FLIGHT,XS(F)::R(D)+S(E)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • Q(i);XR(I)::S(E)
        • R(h);XR(I)::S(E)
      • Refutation
        • K(c);CHECK,S_FLIGHT,XS(E)
    • Try
      • S(E);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR2(B)
        • Q(i);XR(I)::S(E)
        • R(h);XR(I)::S(E)
      • Refutation
        • K(c);CHECK,S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);CHECK,P-FLIGHT,XQ(B)::B(H)+S(E)
      • Refutation
        • B(j);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);CHECK,P-FLIGHT::B(H)+S(E)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);CHECK,P-FLIGHT::B(H)+S(E)
        • K(c);CHECK,S_FLIGHT,XS(F)::R(D)+S(E)
      • Refutation
        • B(j);P_SPINB(j)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P_PINQ(B),S_FLIGHT,XS(F)::R(D)+S(E)
      • Refutation
        • P(a);CHECK,XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • K(c);CHECK,P-FLIGHT::B(H)+S(E)
      • K(c);CHECK,S_FLIGHT,XS(F)::R(D)+S(E)
      • Q(i);SBLOCK,XS(F)::QAR1(B),XP(b)
      • Q(i);N_GUARD,XB(G)::R(I)+S(E)
      • R(h);N_GUARD,XP(C)::R(I)+S(E)
      • B(j);SBLOCK::QAB1(B)
      • S(f);S_CUTB(j)::QAR2(B)
HTML5 logo

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).