MESON Chess Problem Database

Problem Display
PID: 229328 (8/4B3/pp6/8/kP6/3Q4/8/2K5 w - - 0 1)

Matthaus, Hans Georg

Deutsche Schachzeitung, 1973

8/4B3/pp6/8/kP6/3Q4/8/2K5

#2

4 + 3

15148 Sadier Collection 2021
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Tries
    • 1.Kb2?
      • threat
        • 2.Qxa6#
      • 1...b5
        • 2.Qc2#
        • 2.Qd1#
        • 2.Qa3#
        • 2.Qb3#
      • 1...a5!
    • 1.Kc2?
      • threat
        • 2.Qxa6#
      • 1...b5
        • 2.Qb3#
      • 1...a5!
    • 1.Qc2+?
      • 1...Ka3
        • 2.b5#
      • 1...Kb5!
    • 1.b5?
      • 1...axb5
        • 2.Qa3#
      • 1...a5
        • 2.Qc4#
      • 1...Ka5!
  • Keys
    • 1.Qc4!
      • 1...Ka3
        • 2.b5#
      • 1...a5
        • 2.b5#
      • 1...b5
        • 2.Qa2#

Anticipated by 227619(1926)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Threat
        • QAR2(B),XP(b)
      • Refutation
        • P(b);
    • Try
      • K(A);P-FLIGHT
      • Threat
        • QAR2(B),XP(b)
      • Vars
        • P(c);SBLOCK::QAB1(B)
      • Refutation
        • P(b);
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::B(D)+P(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • P(C);
      • Vars
        • P(b);SBLOCK,XP(C)::QAR1(B)
        • P(b);SBLOCK::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);P-FLIGHT::B(D)+P(C)
      • P(b);SBLOCK::QAR(B)+P(C)
      • P(c);SBLOCK::QAR2(B)
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