MESON Chess Problem Database

Problem Display
PID: 164966 (8/8/2p1pb2/2Pk4/R2B4/3Qp2B/8/K6b w - - 0 1)

Gibbins, Norman Martin

The Observer, 1927

(First published on Sun Feb 6 1927)

8/8/2p1pb2/2Pk4/R2B4/3Qp2B/8/K6b

#2

6 + 6

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Bg2
      • 2.Bxg2#
    • 1...Be4
      • 2.Qc4#
      • 2.Qb3#
    • 1...Bxd4+
      • 2.Qxd4#
    • 1...e5
      • 2.Bxe3#
  • Tries
    • 1.Bf5?
      • threat
        • 2.Qc4#
        • 2.Qb3#
      • 1...Bxd4+
        • 2.Qxd4#
      • 1...exf5!
    • 1.Bb2+?
      • 1...Bd4
        • 2.Qxd4#
      • 1...Kxc5!
    • 1.Bc3+?
      • 1...Bd4
        • 2.Qxd4#
      • 1...Kxc5!
    • 1.Be5+?
      • 1...Kxe5
        • 2.Qd4#
        • 2.Qd6#
      • 1...Kxc5!
    • 1.Qxe3?
      • threat
        • 2.Bxe6#
        • 2.Qxe6#
      • 1...Bxd4+
        • 2.Qxd4#
      • 1...Be4
        • 2.Qb3#
      • 1...Be5
        • 2.Qxe5#
      • 1...e5!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Qxh1#
      • 1...Bxd4+
        • 2.Qxd4#
      • 1...Ke4
        • 2.Bxf6#
      • 1...Bf3
        • 2.Qxf3#
      • 1...Bg2
        • 2.Bxg2#
      • 1...Be4
        • 2.Qb3#
      • 1...e5
        • 2.Bxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(a);N_GUARD::B(C),XB(a)
    • B(f);CHECK,P_SPINB(f),XB(E)::QAR1(B),XB(f)
    • P(e);N_PINB(E),SBLOCK::QAR(B)+B(E),XP(b)
  • Tries
    • Try
      • B(C);
      • Threat
        • DUALS(2)
      • Vars
        • B(f);CHECK,P_SPINB(f),XB(E)::QAR1(B),XB(f)
      • Refutation
        • P(e);XB(C)
    • Try
      • B(E);CHECK
      • Vars
        • B(f);N_GUARD,P_SPINB(f)::QAR1(B),XB(f)
      • Refutation
        • K(c);P-FLIGHT,XP(F)
    • Try
      • B(E);CHECK
      • Vars
        • B(f);N_GUARD,P_SPINB(f)::QAR1(B),XB(f)
      • Refutation
        • K(c);P-FLIGHT,XP(F)
    • Try
      • B(E);CHECK
      • Refutation
        • K(c);P-FLIGHT,XP(F)
    • Try
      • Q(B);XP(b)
      • Threat
        • DUALS(2)
      • Vars
        • B(f);CHECK,XB(E)::QAR1(B),XB(f)
        • B(a);SBLOCK::QAB(B)
        • B(f);N_GUARD::QAR1(B),XB(f)
      • Refutation
        • P(e);N_PINB(E)
  • Actual
    • Q(B);
    • Threat
      • QAB(B),XB(a)
    • Vars
      • B(f);CHECK,P_SPINB(f),XB(E)::QAR1(B),XB(f)
      • K(c);S_FLIGHT::R(D)+B(E),XB(f)
      • B(a);N_GUARD::QAB(B),XB(a)
      • B(a);N_GUARD::B(C),XB(a)
      • B(a);SBLOCK::QAB(B)
      • P(e);N_PINB(E),SBLOCK::QAR(B)+B(E),XP(b)
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