MESON Chess Problem Database

Problem Display
PID: 234379 (3r4/6Q1/3p4/N1PrP3/K2k4/R7/8/7B w - - 0 1)

Ellerman, Arnoldo

Problemas, 1954

3r4/6Q1/3p4/N1PrP3/K2k4/R7/8/7B

#2

7 + 4

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc5
      • 2.Qa7#
    • 1...dxe5
      • 2.Qg1#
  • Tries
    • 1.Rd3+?
      • 1...Kxc5
        • 2.Qa7#
        • 2.Qc7#
      • 1...Kxd3!
    • 1.Qg3?
      • threat
        • 2.Qc3#
        • 2.Qe3#
      • 1...Rxc5
        • 2.Rd3#
        • 2.Qf4#
        • 2.Qe3#
      • 1...Rxe5
        • 2.Qc3#
      • 1...Kxc5!
    • 1.Qg4+?
      • 1...Kxc5
        • 2.Qb4#
      • 1...Kxe5!
    • 1.Qb7?
      • threat
        • 2.Qxd5#
      • 1...Kxc5
        • 2.Qb4#
        • 2.Qa7#
      • 1...Rxc5
        • 2.Qe4#
      • 1...Rxe5
        • 2.Qb4#
      • 1...dxc5
        • 2.Qb2#
      • 1...dxe5
        • 2.Qb4#
      • 1...Kxe5!
    • 1.e6+?
      • 1...Kxc5
        • 2.Qa7#
      • 1...Re5!
  • Keys
    • 1.Qf7!
      • threat
        • 2.Qxd5#
      • 1...Kxc5
        • 2.Qa7#
      • 1...Kxe5
        • 2.Sc6#
      • 1...Rxc5
        • 2.Qf4#
      • 1...Rxe5
        • 2.Qc4#
      • 1...dxc5
        • 2.Qf4#
      • 1...dxe5
        • 2.Qf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(a);OGATEB,S_FLIGHT,XP(E)::QAB(G)
    • P(c);P_SPINP(c),SBLOCK,XP(F)::QAB(G)
  • Tries
    • Try
      • R(B);CHECK
      • Refutation
        • K(a);P-FLIGHT,XR(B)
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);SBLOCK,XP(F)::QAB1(G)
      • Refutation
        • K(a);S_FLIGHT,XP(E)
    • Try
      • Q(G);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT,XP(E)::QAB1(G)
      • Refutation
        • K(a);S_FLIGHT,XP(F)
    • Try
      • Q(G);
      • Threat
        • QAR1(G),XR(b)
      • Vars
        • R(b);OGATE,SBLOCK,XP(E)::QAR1(G)
        • R(b);SBLOCK,XP(F)::QAR2(G)
        • P(c);SBLOCK,XP(E)::QAB(G)
        • P(c);SBLOCK,XP(F)::QAR2(G)
      • Refutation
        • K(a);S_FLIGHT,XP(F)
    • Try
      • P(F);CHECK
      • Vars
        • K(a);OGATEB,S_FLIGHT,XP(E)::QAB(G)
      • Refutation
        • R(b);P_SPINR(b)
  • Actual
    • Q(G);
    • Threat
      • QAR1(G),XR(b)
    • Vars
      • K(a);OGATEB,S_FLIGHT,XP(E)::QAB(G)
      • K(a);S_FLIGHT,XP(F)::S(D)
      • R(b);SBLOCK,XP(E)::QAR2(G)
      • R(b);OGATE,SBLOCK,XP(F)::QAR1(G)
      • P(c);SBLOCK,XP(E)::QAR2(G)
      • P(c);SBLOCK,XP(F)::QAB(G)
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