MESON Chess Problem Database

Problem Display
PID: 152030 (1B6/4p3/1K1P1P2/3k2p1/8/2PB3Q/8/b6n w - - 0 1)

Challenger, Alfred Clement

Hampstead and Highgate Express, 1898

(First published on Sat Jan 8 1898)

1B6/4p3/1K1P1P2/3k2p1/8/2PB3Q/8/b6n

#2

7 + 5

14867 BCPS Library 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Qf5#
    • 1...exd6
      • 2.Qf5#
    • 1...exf6
      • 2.Qf5#
  • Tries
    • 1.Qe3?
      • threat
        • 2.Qe4#
        • 2.c4#
      • 1...Bxc3
        • 2.Qe4#
      • 1...Sf2
        • 2.c4#
      • 1...Sg3
        • 2.c4#
      • 1...e5!
    • 1.Qf3+?
      • 1...Ke5
        • 2.Qf5#
      • 1...Ke6!
    • 1.dxe7?
      • threat
        • 2.Qf5#
        • 2.Qd7#
      • 1...Bxc3
        • 2.Qd7#
      • 1...Sg3
        • 2.Qd7#
      • 1...g4!
    • 1.d7?
      • threat
        • 2.d8Q#
        • 2.d8R#
      • 1...Bxc3
        • 2.d8Q#
        • 2.d8R#
      • 1...exf6
        • 2.Qf5#
        • 2.d8Q#
        • 2.d8R#
      • 1...Sf2
        • 2.d8Q#
        • 2.d8R#
      • 1...Bb2
        • 2.d8Q#
        • 2.d8R#
      • 1...Sg3
        • 2.d8Q#
        • 2.d8R#
      • 1...e5
        • 2.d8Q#
        • 2.d8R#
      • 1...e6
        • 2.Qg2#
        • 2.Qxh1#
        • 2.Qf3#
        • 2.d8Q#
        • 2.d8R#
      • 1...g4!
  • Keys
    • 1.Qd7!
      • threat
        • 2.dxe7#
      • 1...Ke5
        • 2.Qf5#
      • 1...exd6
        • 2.Qf5#
        • 2.Qxd6#
      • 1...exf6
        • 2.Qf5#
      • 1...e5
        • 2.Qf7#
      • 1...e6
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(c);P-FLIGHT::QAR1(C)
    • P(e);N_GUARD,XP(E)::QAR2(C)
    • P(e);N_GUARD,XP(F)::QAR2(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);XP(A)::QAB1(C)
        • S(b);::P(A)
      • Refutation
        • P(e);
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(C)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • P(E);XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);XP(A)::QAR2(C)
        • S(b);::QAR2(C)
      • Refutation
        • P(d);
    • Try
      • P(E);
      • Threat
        • P=Q
      • Vars
        • B(a);XP(A)::P=Q
        • S(b);::P=Q
        • B(a);::P=Q
        • P(e);::P=Q
      • Refutation
        • P(d);
  • Actual
    • Q(C);
    • Threat
      • QAR(C)+P(E),XP(e)
    • Vars
      • K(c);P-FLIGHT::QAR1(C)
      • P(e);N_GUARD,XP(F)::QAR2(C)
      • P(e);OGATE,SBLOCK::QAB(C)
      • P(e);SBLOCK::QAR2(C)
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