MESON Chess Problem Database

Problem Display
PID: 141535 (b4N1K/r3p3/2ppp1pp/2Nk1P1R/5p2/2QP1r2/8/7q w - - 0 1)

Gross, Erwin

Probleemblad, 1977

b4N1K/r3p3/2ppp1pp/2Nk1P1R/5p2/2QP1r2/8/7q

#2

7 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...e5
      • 2.Qc4#
  • Tries
    • 1.Sfxe6?
      • threat
        • 2.Qd4#
      • 1...Rxd3
        • 2.Sxf4#
      • 1...dxc5
        • 2.Qxc5#
      • 1...Qa1
        • 2.fxg6#
      • 1...Ra4
        • 2.Sc7#
      • 1...Qg1!
    • 1.Sfd7?
      • threat
        • 2.Sb6#
        • 2.Qc4#
      • 1...Rxd3
        • 2.Sb6#
        • 2.Qxd3#
      • 1...dxc5
        • 2.Qe5#
        • 2.Qxc5#
      • 1...Qa1
        • 2.Sb6#
      • 1...Qb1
        • 2.Qc4#
      • 1...Qc1
        • 2.Sb6#
      • 1...Ra4
        • 2.Sb6#
      • 1...Ra6
        • 2.Qc4#
      • 1...Rb7
        • 2.Qc4#
      • 1...Rxd7!
    • 1.fxg6+?
      • 1...e5
        • 2.Qc4#
      • 1...Qxh5!
  • Keys
    • 1.Sxg6!
      • threat
        • 2.Qc4#
      • 1...Rxd3
        • 2.Sxf4#
      • 1...dxc5
        • 2.Qe5#
      • 1...Qa1
        • 2.fxe6#
      • 1...Qc1
        • 2.fxe6#
      • 1...Ra4
        • 2.Sxe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • P(g);SBLOCK::QAB1(A)
  • Tries
    • Try
      • S(F);XP(g)
      • Threat
        • QAR1(A)
      • Vars
        • R(b);N_GUARD,XP(B)::S(F),XP(c)
        • P(f);OGATE,XS(C)::QAR1(A),XP(f)
        • Q(a);N_GUARD,P_PINQ(A)::R(E)+P(D),XP(h)
        • R(j);N_GUARD::S(F)
      • Refutation
        • Q(a);
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);P_PINQ(A)::S(F)
        • Q(a);::QAB1(A)
        • Q(a);::S(F)
        • R(j);::S(F)
        • R(j);::QAB1(A)
      • Refutation
        • R(j);XS(F)
    • Try
      • P(D);CHECK,XP(h)
      • Vars
        • P(g);P_SPINP(g)::QAB1(A)
      • Refutation
        • Q(a);XR(E)
  • Actual
    • S(F);XP(h)
    • Threat
      • QAB1(A)
    • Vars
      • R(b);N_GUARD,XP(B)::S(F),XP(c)
      • P(f);N_GUARD,SBLOCK,XS(C)::QAR1(A)
      • Q(a);N_GUARD,P_PINQ(A)::R(E)+P(D),XP(g)
      • Q(a);N_GUARD::R(E)+P(D),XP(g)
      • R(j);N_GUARD::S(F),XP(k)
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