MESON Chess Problem Database

Problem Display
PID: 65303 (8/8/6p1/2PpkPP1/8/3Q1K2/3P4/8 w - - 0 1)

Jakab, Arpad

Good Companions (April), 1922

8/8/6p1/2PpkPP1/8/3Q1K2/3P4/8

#2

6 + 3

3132 The Good Companion Two-Mover 1922
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...d4
      • 2.Qe4#
    • 1...gxf5
      • 2.Qe3#
  • Tries
    • 1.Kg3?
      • 1...gxf5
        • 2.Qe3#
      • 1...d4!
    • 1.Qc2?
      • 1...Kd4
        • 2.Qc3#
      • 1...d4
        • 2.Qe4#
      • 1...gxf5!
    • 1.Qa6?
      • threat
        • 2.Qf6#
      • 1...Kxf5
        • 2.Qf6#
      • 1...d4
        • 2.Qe6#
      • 1...Kd4!
    • 1.Qc3+?
      • 1...Kxf5
        • 2.Qf6#
      • 1...d4!
    • 1.Qd4+?
      • 1...Kxf5
        • 2.Qf6#
        • 2.Qxd5#
      • 1...Kxd4!
    • 1.fxg6?
      • 1...d4
        • 2.Qe4#
      • 1...Ke6!
    • 1.f6?
      • 1...d4
        • 2.Qe4#
      • 1...Ke6!
  • Keys
    • 1.Qb3!
      • 1...Kd4
        • 2.Qc3#
      • 1...Kxf5
        • 2.Qxd5#
      • 1...gxf5
        • 2.Qe3#
      • 1...d4
        • 2.Qe6#

Anticipated by 149058(1918)

This anticipates 194727(1941), 18421(1955)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(a);N_GUARD::QAR1(B)
    • P(c);SBLOCK,XP(E)::QAR2(B)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Vars
        • P(c);SBLOCK,XP(E)::QAR2(B)
      • Refutation
        • P(a);
    • Try
      • Q(B);
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
        • P(a);N_GUARD::QAR1(B)
      • Refutation
        • P(c);XP(E)
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • K(b);P-FLIGHT,XP(E)::QAR1(B)
        • P(a);SBLOCK::QAR1(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT,XP(E)::QAR1(B)
      • Refutation
        • P(a);P_SPINP(a)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(b);S_FLIGHT,XQ(B)
    • Try
      • P(E);XP(c)
      • Vars
        • P(a);N_GUARD::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • P(E);
      • Vars
        • P(a);N_GUARD::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(b);S_FLIGHT::QAB1(B)
      • K(b);P-FLIGHT,XP(E)::QAR2(B),XP(a)
      • P(c);SBLOCK,XP(E)::QAR2(B)
      • P(a);OGATE,SBLOCK::QAR1(B)
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