MESON Chess Problem Database

Problem Display
PID: 151267 (3K4/5N2/1p6/1Npk4/8/8/2Q4n/8 w - - 0 1)

Challenger, Alfred Clement

Hampstead and Highgate Express, 1896

(First published on Sat Nov 7 1896)

3K4/5N2/1p6/1Npk4/8/8/2Q4n/8

#2

4 + 4

14867 BCPS Library 2014
5454 Near Snap 2016

SOLUTION

  • SOUND
  • Tries
    • 1.Kd7?
      • threat
        • 2.Qd3#
      • 1...c4
        • 2.Qf5#
      • 1...Sf3!
    • 1.Sc7+?
      • 1...Kc6
        • 2.Qe4#
      • 1...Kd4!
    • 1.Sfd6?
      • threat
        • 2.Qe4#
      • 1...Ke5
        • 2.Qf5#
      • 1...Kc6
        • 2.Qe4#
      • 1...Ke6
        • 2.Qf5#
      • 1...c4!
    • 1.Qd3+?
      • 1...Kc6
        • 2.Qd7#
      • 1...Ke6!
    • 1.Qf5+?
      • 1...Kc6
        • 2.Qd7#
      • 1...Kc4!
  • Keys
    • 1.Sbd6!
      • threat
        • 2.Qe4#
      • 1...Kd4
        • 2.Qd2#
      • 1...Kc6
        • 2.Qe4#
      • 1...Ke6
        • 2.Qf5#
      • 1...c4
        • 2.Qxc4#

This anticipates 158214(1906-1907)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Threat
        • QAR2(A)
      • Vars
        • P(b);SBLOCK::QAR2(A)
      • Refutation
        • S(a);
    • Try
      • S(B);CHECK
      • Vars
        • K(c);P_SPINP(b),S_FLIGHT::QAB(A)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • S(C);
      • Threat
        • QAB1(A)
      • Vars
        • K(c);P-FLIGHT::QAR1(A)
        • K(c);P_SPINP(b),S_FLIGHT::QAB(A)
        • K(c);S_FLIGHT::QAB1(A)
      • Refutation
        • P(b);
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);OGATE,S_FLIGHT::QAB1(A)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB1(A)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • S(B);
    • Threat
      • QAB1(A)
    • Vars
      • K(c);P-FLIGHT::QAR2(A)
      • K(c);P_SPINP(b),S_FLIGHT::QAB(A)
      • K(c);S_FLIGHT::QAB1(A)
      • P(b);::QAB1(A),XP(b)
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