MESON Chess Problem Database

Problem Display
PID: 229686 (8/b7/8/1kp5/R3Q3/2K5/8/8 w - - 0 1)

Matthaus, Hans Georg

Deutsche Schachzeitung, 1976

8/b7/8/1kp5/R3Q3/2K5/8/8

#2

3 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bb6
      • 2.Qe8#
  • Tries
    • 1.Ra6?
      • threat
        • 2.Qc6#
        • 2.Qa4#
        • 2.Qc4#
      • 1...c4
        • 2.Qc6#
        • 2.Qxc4#
      • 1...Bb6
        • 2.Qa4#
      • 1...Kxa6!
    • 1.Rxa7?
      • threat
        • 2.Qb7#
      • 1...Kb6
        • 2.Qb7#
      • 1...c4!
    • 1.Qg6?
      • threat
        • 2.Qa6#
      • 1...Kxa4
        • 2.Qa6#
      • 1...Bb6
        • 2.Qe8#
      • 1...c4!
    • 1.Qe6?
      • threat
        • 2.Qa6#
      • 1...Kxa4
        • 2.Qa6#
      • 1...Bb6
        • 2.Qd7#
        • 2.Qe8#
      • 1...c4!
  • Keys
    • 1.Qb7+!
      • 1...Kxa4
        • 2.Qa6#
      • 1...Bb6
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • B(c);SBLOCK::QAB(C)
  • Tries
    • Try
      • R(B);
      • Threat
        • DUALS(3)
      • Vars
        • B(c);::QAB1(C)
      • Refutation
        • K(a);S_FLIGHT,XR(B)
    • Try
      • R(B);XB(c)
      • Threat
        • QAR2(C)
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
      • Refutation
        • P(b);
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • K(a);S_FLIGHT,XR(B)::QAR2(C)
        • B(c);SBLOCK::QAB(C)
      • Refutation
        • P(b);
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • K(a);S_FLIGHT,XR(B)::QAR2(C)
      • Refutation
        • P(b);
  • Actual
    • Q(C);CHECK
    • Vars
      • K(a);S_FLIGHT,XR(B)::QAR2(C)
      • B(c);P_SPINB(c),SBLOCK::QAB(C)
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