MESON Chess Problem Database

Problem Display
PID: 270618 (7R/kpp5/1p6/8/p1Q5/rR6/p7/K7 w - - 0 1)

Barnes, Barry Peter

The Problemist Supplement, 2023

7R/kpp5/1p6/8/p1Q5/rR6/p7/K7

#2

4 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb3
      • 2.Qxa4#
  • Tries
    • 1.Qb5?
      • 1...Rxb3
        • 2.Qxa4#
      • 1...c5
        • 2.Qxb6#
      • 1...c6
        • 2.Qxb6#
      • 1...axb3!
    • 1.Qa6+?
      • 1...Kxa6
        • 2.Ra8#
      • 1...bxa6!
    • 1.Qg8?
      • threat
        • 2.Qa8#
      • 1...Ka6
        • 2.Qa8#
      • 1...b5!
  • Keys
    • 1.Qb4!
      • 1...Ka6
        • 2.Ra8#
      • 1...Rxb3
        • 2.Qxa4#
      • 1...axb3
        • 2.Qxa3#
      • 1...b5
        • 2.Qa5#
      • 1...c5
        • 2.Qxb6#
      • 1...c6
        • 2.Qxb6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(b);N_GUARD,XR(B)::QAR(C),XP(c)
  • Tries
    • Try
      • Q(C);
      • Vars
        • R(b);N_GUARD,XR(B)::QAR(C),XP(c)
        • P(g);N_GUARD::QAB1(C),XP(d)
      • Refutation
        • P(c);XR(B)
    • Try
      • Q(C);CHECK
      • Vars
        • K(e);P-FLIGHT,XQ(C)::R(D)
      • Refutation
        • P(f);XQ(C)
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • K(e);P-FLIGHT::QAR2(C)
      • Refutation
        • P(d);
  • Actual
    • Q(C);
    • Vars
      • K(e);N_GUARD,P-FLIGHT::R(D)
      • R(b);N_GUARD,XR(B)::QAR(C),XP(c)
      • P(c);OGATEB,XR(B)::QAR(C),XR(b)
      • P(d);N_GUARD::QAR2(C)
      • P(g);N_GUARD::QAB1(C),XP(d)
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