MESON Chess Problem Database

Problem Display
PID: 155455 (3K4/4Q3/r7/kp6/7R/8/1P6/8 w - - 0 1)

Brozus, Hartmut

Der Tagesspiegel (Berlin), 2000

3K4/4Q3/r7/kp6/7R/8/1P6/8

#2

4 + 3

15391 Problemschach-Jahrbuch (2000) 2001

SOLUTION

  • SOUND
  • Sets
    • 1...Kb6
      • 2.Qc7#
    • 1...Rb6
      • 2.Qa3#
    • 1...Ra7
      • 2.Qxa7#
    • 1...b4
      • 2.Qxb4#
  • Tries
    • 1.Qe1+?
      • 1...b4
        • 2.Qxb4#
      • 1...Kb6!
    • 1.b4+?
      • 1...Kb6
        • 2.Rh6#
        • 2.Qc7#
      • 1...Ka4!
  • Keys
    • 1.Ra4+!
      • 1...Kxa4
        • 2.Qa3#
      • 1...Kb6
        • 2.Qc7#
      • 1...bxa4
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • K(a);S_FLIGHT::QAB1(C)
    • R(c);SBLOCK::QAR2(C)
    • R(c);OGATEB::QAR2(C),XR(c)
    • P(b);::QAB1(C),XP(b)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • P(b);P_SPINP(b)::QAB1(C),XP(b)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • P(A);CHECK
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • R(B);CHECK
    • Vars
      • K(a);P-FLIGHT,XR(B)::QAR1(C)
      • K(a);S_FLIGHT::QAB1(C)
      • P(b);SBLOCK,XR(B)::QAR2(C)
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