MESON Chess Problem Database

Problem Display
PID: 151776 (7K/1b2P1p1/2p2bQR/p7/r2kp3/2pNN3/3PP3/8 w - - 0 1)

Challenger, Alfred Clement

Hampstead and Highgate Express, 1897

(First published on Sat Sep 4 1897)

7K/1b2P1p1/2p2bQR/p7/r2kp3/2pNN3/3PP3/8

#2

8 + 9

14867 BCPS Library 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Bh4
      • 2.Qd6#
    • 1...Bg5
      • 2.Qd6#
    • 1...gxh6+
      • 2.Qxf6#
  • Tries
    • 1.Sf5+?
      • 1...Kd5
        • 2.Qf7#
      • 1...Kc4!
    • 1.Qf5?
      • threat
        • 2.Qd7#
        • 2.Qc5#
      • 1...gxh6+
        • 2.Qxf6#
      • 1...g5+
        • 2.Qxf6#
      • 1...g6+
        • 2.Qxf6#
      • 1...Bxe7
        • 2.Qe5#
      • 1...cxd2
        • 2.Qc5#
      • 1...Rc4
        • 2.Sc2#
        • 2.Qd7#
      • 1...Be5
        • 2.Qxe5#
      • 1...Bc8
        • 2.Qc5#
      • 1...c5
        • 2.Qxc5#
      • 1...exd3!
  • Keys
    • 1.Qg5!
      • threat
        • 2.Qc5#
      • 1...gxh6+
        • 2.Qxf6#
      • 1...g6+
        • 2.Qxf6#
      • 1...Bxg5
        • 2.Rd6#
      • 1...Bxe7
        • 2.Qe5#
      • 1...exd3
        • 2.Rh4#
      • 1...Rc4
        • 2.Sc2#
      • 1...Be5
        • 2.Qxe5#
      • 1...c5
        • 2.Qxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • B(g);OGATE::QAR2(E)
    • P(i);CHECK,N_GUARD,XR(F)::QAB(E),XB(g)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB(E)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • P(i);CHECK,N_GUARD,XR(F)::QAB(E),XB(g)
        • P(i);CHECK,N_GUARD::QAB(E),XB(g)
        • B(g);N_GUARD,XP(G)::QAB1(E)
        • P(a);XP(A)::QAB1(E)
        • B(g);N_GUARD::QAB1(E),XB(g)
        • B(h);::QAB1(E)
        • P(f);::QAB1(E),XP(f)
      • Refutation
        • P(d);XS(C)
  • Actual
    • Q(E);
    • Threat
      • QAB1(E)
    • Vars
      • P(i);CHECK,N_GUARD,XR(F)::QAB(E),XB(g)
      • P(i);CHECK,N_GUARD::QAB(E),XB(g)
      • B(g);OGATE,XQ(E)::R(F)
      • B(g);N_GUARD,XP(G)::QAB1(E)
      • P(d);OGATEB,XS(C)::R(F)
      • R(b);SBLOCK::S(D)
      • B(g);N_GUARD::QAB1(E),XB(g)
      • P(f);::QAB1(E),XP(f)
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