MESON Chess Problem Database

Problem Display
PID: 109414 (3K2Q1/p7/RnpkP3/3n4/1P2r3/5N2/B7/3R4 w - - 0 1)

Sokka, Hannu Erkki Juhani

Suomen Tehtavaniekat TT, 1974

3K2Q1/p7/RnpkP3/3n4/1P2r3/5N2/B7/3R4

#2

8 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sa4
      • 2.Rxd5#
    • 1...Sd7
      • 2.Rxd5#
    • 1...Sa8
      • 2.Rxd5#
    • 1...Sc8
      • 2.Rxd5#
  • Tries
    • 1.Qf7?
      • threat
        • 2.Qe7#
      • 1...Rxe6
        • 2.Qc7#
      • 1...c5
        • 2.Qd7#
      • 1...Sc8
        • 2.Rxd5#
        • 2.Qd7#
      • 1...Rd4!
    • 1.Qh7?
      • threat
        • 2.Qe7#
      • 1...Kxe6
        • 2.Qg6#
      • 1...Rxe6
        • 2.Qc7#
      • 1...c5
        • 2.Qd7#
      • 1...Sc8
        • 2.Qd7#
      • 1...Rd4!
    • 1.Qg3+?
      • 1...Kxe6
        • 2.Qg6#
      • 1...Re5
        • 2.Qxe5#
      • 1...Rf4!
    • 1.Qg5?
      • threat
        • 2.Qe7#
      • 1...Kxe6
        • 2.Qg6#
      • 1...c5
        • 2.Qxd5#
      • 1...Rd4
        • 2.Qe5#
      • 1...Sc8
        • 2.Qxd5#
      • 1...Rxe6!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qe7#
      • 1...Kxe6
        • 2.Qg6#
      • 1...Rxe6
        • 2.Qc7#
      • 1...c5
        • 2.Qd7#
      • 1...Rd4
        • 2.Qe5#
      • 1...Sc8
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • S(c);N_GUARD,P_SPINP(d)::R1(A),XS(b)
  • Tries
    • Try
      • Q(H);
      • Threat
        • QAB1(H)
      • Vars
        • R(a);SBLOCK,XP(F)::QAB1(H)
        • P(d);S_CUTS(c)::QAR1(H)
      • Refutation
        • R(a);N_SPINS(b)
    • Try
      • Q(H);
      • Threat
        • QAB1(H)
      • Vars
        • K(e);OGATEB,P-FLIGHT,XP(F)::QAR2(H)
        • R(a);SBLOCK,XP(F)::QAB1(H)
        • P(d);S_CUTS(c)::QAR1(H)
        • S(c);N_GUARD,P_SPINP(d)::QAR1(H)
      • Refutation
        • R(a);N_SPINS(b)
    • Try
      • Q(H);CHECK
      • Vars
        • K(e);OGATEB,P-FLIGHT,XP(F)::QAR2(H)
        • R(a);N_GUARD,P_SPINR(a)::QAB1(H),XR(a)
      • Refutation
        • R(a);P_SPINR(a)
    • Try
      • Q(H);
      • Threat
        • QAB1(H)
      • Vars
        • K(e);OGATEB,P-FLIGHT,XP(F)::QAR2(H)
        • P(d);N_GUARD,S_CUTS(c)::QAR1(H),XS(b)
        • R(a);N_GUARD,N_SPINS(b)::QAB1(H)
        • S(c);N_GUARD,P_SPINP(d)::QAR1(H),XS(b)
      • Refutation
        • R(a);XP(F)
  • Actual
    • Q(H);
    • Threat
      • QAB1(H)
    • Vars
      • K(e);OGATEB,P-FLIGHT,XP(F)::QAR2(H)
      • R(a);SBLOCK,XP(F)::QAB1(H)
      • P(d);S_CUTS(c)::QAR1(H)
      • R(a);N_GUARD,N_SPINS(b)::QAB1(H)
      • S(c);N_GUARD,P_SPINP(d)::QAR1(H)
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