MESON Chess Problem Database

Problem Display
PID: 79358 (4R3/3B4/8/B2Q4/6P1/7q/1PPP4/1KNk4 w - - 0 1)

Barnes, Barry Peter

The Tablet, 1964

(First published on Sat Sep 26 1964)

4R3/3B4/8/B2Q4/6P1/7q/1PPP4/1KNk4

#2

10 + 2

56 The Problemist 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg4
      • 2.Bxg4#
    • 1...Qh1
      • 2.Qxh1#
    • 1...Qa3
      • 2.Qh1#
    • 1...Qb3
      • 2.Qh1#
    • 1...Qc3
      • 2.dxc3#
    • 1...Qe3
      • 2.dxe3#
    • 1...Qf3
      • 2.Qxf3#
    • 1...Qh4
      • 2.Qf3#
    • 1...Qh5
      • 2.Qf3#
    • 1...Qh6
      • 2.Qf3#
    • 1...Qh7
      • 2.Qf3#
    • 1...Qh8
      • 2.Qf3#
  • Tries
    • 1.Qh1+?
      • 1...Qf1
        • 2.Qxf1#
      • 1...Qxh1!
  • Keys
    • 1.Ba4!
      • threat
        • 2.c3#
      • 1...Qxg4
        • 2.c4#
      • 1...Qe3
        • 2.dxe3#
      • 1...Qa3
        • 2.Qh1#
      • 1...Qb3
        • 2.Qh1#
      • 1...Qc3
        • 2.dxc3#
      • 1...Qd3
        • 2.cxd3#
      • 1...Qh7
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • Q(b);OGATE,XP(F)::B(I),XQ(b)
    • Q(b);N_GUARD::QAR(H),XQ(b)
    • Q(b);N_GUARD::QAR(H)
    • Q(b);N_GUARD,P_PINP(C)::QAR(H)
    • Q(b);OGATE::QAR(H)+P(E),XQ(b)
    • Q(b);N_GUARD::QAB(H),XQ(b)
    • Q(b);N_GUARD::QAB(H)
    • Q(b);N_GUARD,P_PINP(D)::QAB(H)
  • Tries
    • Try
      • Q(H);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAR2(H),XQ(b)
      • Refutation
        • Q(b);XQ(H)
  • Actual
    • B(I);
    • Threat
      • B(I)+P(D)
    • Vars
      • Q(b);N_GUARD,XP(F)::B(I)+P(D)
      • Q(b);OGATE::QAR(H)+P(E),XQ(b)
      • Q(b);N_GUARD::QAR(H)
      • Q(b);N_GUARD,P_PINP(C)::QAR(H)
      • Q(b);OGATE,P_PINP(D)::B(I)+P(D),XQ(b)
      • Q(b);N_GUARD,P_PINP(D)::QAB(H)
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