MESON Chess Problem Database

Problem Display
PID: 234527 (3n2k1/8/4P1NK/8/8/p7/Q7/8 w - - 0 1)

Speckmann, Werner

Schach-Nachrichten, 1978

3n2k1/8/4P1NK/8/8/p7/Q7/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sc6
      • 2.e7#
    • 1...Sxe6
      • 2.Qxe6#
    • 1...Sb7
      • 2.e7#
    • 1...Sf7+
      • 2.exf7#
  • Tries
    • 1.Se7+?
      • 1...Kh8
        • 2.Qa1#
      • 1...Kf8!
    • 1.Qb3?
      • 1...Sf7+
        • 2.exf7#
      • 1...Sxe6
        • 2.Qxe6#
      • 1...Sc6
        • 2.e7#
      • 1...Sb7
        • 2.e7#
      • 1...a2!
    • 1.Qc4?
      • 1...Sf7+
        • 2.exf7#
      • 1...Sxe6
        • 2.Qxe6#
      • 1...Sc6
        • 2.e7#
      • 1...Sb7
        • 2.e7#
      • 1...a2!
    • 1.Qf2?
      • threat
        • 2.Qf8#
      • 1...Sf7+
        • 2.Qxf7#
        • 2.exf7#
      • 1...Sxe6!
    • 1.e7+?
      • 1...Se6
        • 2.Qxe6#
        • 2.e8Q#
      • 1...Sf7+!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qxd8#
      • 1...Sf7+
        • 2.exf7#
      • 1...Sxe6
        • 2.Qxe6#
      • 1...Sc6
        • 2.e7#
      • 1...Sb7
        • 2.e7#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAB(A)+P(B)
    • S(b);OGATE,P_SPINS(b),XP(B)::QAB(A),XS(b)
    • S(b);CHECK,OGATE::P(B),XS(b)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB(A)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • S(b);CHECK,OGATE::P(B),XS(b)
        • S(b);OGATE,P_SPINS(b),XP(B)::QAB(A),XS(b)
        • S(b);N_GUARD::QAB(A)+P(B)
      • Refutation
        • P(a);
    • Try
      • Q(A);
      • Vars
        • S(b);CHECK,OGATE::P(B),XS(b)
        • S(b);OGATE,P_SPINS(b),XP(B)::QAB(A),XS(b)
        • S(b);N_GUARD::QAB(A)+P(B)
      • Refutation
        • P(a);
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Refutation
        • S(b);XP(B)
    • Try
      • P(B);CHECK
      • Refutation
        • S(b);CHECK,P_SPINS(b)
  • Actual
    • Q(A);
    • Threat
      • QAR(A),XS(b)
    • Vars
      • S(b);CHECK,OGATE::P(B),XS(b)
      • S(b);OGATE,P_SPINS(b),XP(B)::QAB(A),XS(b)
      • S(b);N_GUARD::QAB(A)+P(B)
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