MESON Chess Problem Database

Problem Display
PID: 219462 (k7/2pN4/K7/8/8/3Q4/7b/7b w - - 0 1)

Speckmann, Werner

Schach-Report, 1990

k7/2pN4/K7/8/8/3Q4/7b/7b

#2

3 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Sb6+?
      • 1...Kb8
        • 2.Qd8#
      • 1...cxb6!
    • 1.Qb5?
      • threat
        • 2.Qb8#
      • 1...Bb7+
        • 2.Qxb7#
      • 1...c6
        • 2.Qb7#
      • 1...c5!
    • 1.Qb3?
      • threat
        • 2.Qg8#
        • 2.Qb8#
      • 1...Bb7+
        • 2.Qxb7#
      • 1...Bd5
        • 2.Qb8#
      • 1...Bd6
        • 2.Qb8#
      • 1...c6
        • 2.Qb7#
      • 1...c5!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Qb8#
      • 1...Bb7+
        • 2.Qxb7#
      • 1...c5
        • 2.Qxh1#
      • 1...c6
        • 2.Qb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR2(A)
      • Refutation
        • P(c);XS(C)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • B(a);CHECK,N_GUARD::QAB1(A),XB(a)
        • P(c);S_CUTB(a)::QAB1(A)
      • Refutation
        • P(c);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);CHECK,N_GUARD::QAB1(A),XB(a)
        • B(a);::QAR1(A)
        • B(b);::QAR1(A)
        • P(c);S_CUTB(a)::QAB1(A)
      • Refutation
        • P(c);
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • B(a);CHECK,N_GUARD::QAB1(A),XB(a)
      • P(c);N_GUARD::QAB(A),XB(a)
      • P(c);S_CUTB(a)::QAB1(A)
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