MESON Chess Problem Database

Problem Display
PID: 134893 (3K4/3p4/4k3/R3P3/4R3/6Q1/6q1/BB6 w - - 0 1)

McDowell, Michael

Comm., The Problemist, 2009

3K4/3p4/4k3/R3P3/4R3/6Q1/6q1/BB6

#2

7 + 3

56 The Problemist 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Qh1
      • 2.Qg6#
    • 1...Qh3
      • 2.Qg6#
    • 1...Qa2
      • 2.Qg6#
    • 1...Qb2
      • 2.Qg6#
    • 1...Qc2
      • 2.Qg6#
    • 1...Qd2
      • 2.Qg6#
    • 1...Qe2
      • 2.Qg6#
    • 1...Qh2
      • 2.Qg6#
  • Tries
    • 1.Rf4?
      • threat
        • 2.Rf6#
      • 1...Qf1
        • 2.Qg4#
        • 2.Qg6#
        • 2.Qg8#
      • 1...Qf3
        • 2.Qg6#
        • 2.Qg8#
      • 1...Qf2
        • 2.Qh3#
        • 2.Qg4#
        • 2.Qg6#
        • 2.Qg8#
      • 1...Qa8+!
    • 1.Qxg2?
      • threat
        • 2.Qg6#
      • 1...Kf5
        • 2.Qg4#
      • 1...Kf7!
    • 1.Qg4+?
      • 1...Kf7
        • 2.Rf4#
      • 1...Qxg4!
  • Keys
    • 1.Ba2+!
      • 1...Kf5
        • 2.Rf4#
      • 1...Qxa2
        • 2.Qg6#
      • 1...d5
        • 2.exd5 ep#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • Q(a);N_GUARD::QAR2(C)
  • Tries
    • Try
      • R(D);
      • Threat
        • R1(D)
      • Refutation
        • Q(a);CHECK
    • Try
      • Q(C);XQ(a)
      • Threat
        • QAR2(C)
      • Vars
        • K(b);S_FLIGHT::QAB1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);S_FLIGHT::R(D)
      • Refutation
        • Q(a);XQ(C)
  • Actual
    • B(B);CHECK
    • Vars
      • K(b);S_FLIGHT::R1(D)
      • Q(a);XB(B)::QAR2(C)
      • P(c);OGATE,P_SPINP(c)::R(D)+P(F)DCHECK,XP(c),EP
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