MESON Chess Problem Database

Problem Display
PID: 150069 (8/N7/3pN3/1p1kpK2/1np5/4RP2/Q7/8 w - - 0 1)

Keeble, John Frederick

Leeds Mercury Weekly Supplement, 1903

(First published on Sat Apr 25 1903)

8/N7/3pN3/1p1kpK2/1np5/4RP2/Q7/8

#2

6 + 6

14868 Pirnie Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Sd3
      • 2.Rxd3#
    • 1...Sa6
      • 2.Rd3#
      • 2.Qd2#
    • 1...e4
      • 2.fxe4#
  • Tries
    • 1.Sc8?
      • threat
        • 2.Se7#
      • 1...Sc6
        • 2.Sb6#
      • 1...Kc6!
    • 1.Qb1?
      • threat
        • 2.Qe4#
      • 1...Sc2
        • 2.Qxb5#
      • 1...e4
        • 2.Qxe4#
        • 2.fxe4#
      • 1...Sd3!
    • 1.Qb3?
      • 1...Sc2
        • 2.Qxb5#
      • 1...Sa2
        • 2.Rd3#
        • 2.Qd1#
        • 2.Qxb5#
      • 1...Sd3
        • 2.Rxd3#
      • 1...Sa6
        • 2.Rd3#
        • 2.Qd1#
      • 1...Sc6
        • 2.Qxb5#
      • 1...e4
        • 2.fxe4#
      • 1...cxb3!
    • 1.Qb2?
      • 1...c3
        • 2.Qb3#
      • 1...Sc2
        • 2.Qxb5#
      • 1...Sa2
        • 2.Qd2#
        • 2.Qxb5#
      • 1...Sa6
        • 2.Qd2#
      • 1...Sc6
        • 2.Qxb5#
      • 1...e4
        • 2.Qd4#
        • 2.fxe4#
      • 1...Sd3!
    • 1.Qa5?
      • threat
        • 2.Qxb5#
      • 1...Sa6
        • 2.Qd2#
      • 1...Sd3!
    • 1.Qa6?
      • threat
        • 2.Qxb5#
      • 1...Sd3
        • 2.Qb7#
        • 2.Qc6#
      • 1...Sxa6!
  • Keys
    • 1.Rb3!
      • 1...Sxa2
        • 2.Rxb5#
      • 1...cxb3
        • 2.Qxb3#
      • 1...c3
        • 2.Rxb4#
      • 1...Sc2
        • 2.Rxb5#
      • 1...Sd3
        • 2.Rxd3#
      • 1...Sa6
        • 2.Rd3#
        • 2.Qd2#
      • 1...Sc6
        • 2.Rxb5#
      • 1...e4
        • 2.fxe4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::R(B),XS(a)
    • P(e);OGATE::P(C),XP(e)
  • Tries
    • Try
      • S(F);
      • Threat
        • S(F)
      • Vars
        • S(a);SBLOCK::S(F)
      • Refutation
        • K(d);N_SPINP(b),S_FLIGHT
    • Try
      • Q(A);N_PINP(b)
      • Threat
        • QAB1(A)
      • Vars
        • S(a);OGATE::QAR2(A),XP(c)
      • Refutation
        • S(a);
    • Try
      • Q(A);
      • Vars
        • S(a);OGATE::QAR2(A),XP(c)
        • S(a);N_GUARD::R(B),XS(a)
        • P(e);OGATE::P(C),XP(e)
      • Refutation
        • P(b);N_SPINP(b),XQ(A)
    • Try
      • Q(A);N_PINP(b)
      • Vars
        • P(b);OGATEB::QAB(A)
        • S(a);OGATE::QAR2(A),XP(c)
        • S(a);N_GUARD::QAR(A)
      • Refutation
        • S(a);
    • Try
      • Q(A);N_PINP(b),P_PINP(c)
      • Threat
        • QAR2(A),XP(c)
      • Vars
        • S(a);OGATE::QAR(A)
      • Refutation
        • S(a);
    • Try
      • Q(A);N_PINP(b)
      • Threat
        • QAR2(A),XP(c)
      • Refutation
        • S(a);XQ(A)
  • Actual
    • R(B);N_PINP(b)
    • Vars
      • S(a);OGATE,XQ(A)::R(B),XP(c)
      • P(b);OGATE,P_SPINP(b),XR(B)::QAB(A),XP(b)
      • P(b);OGATEB::QAB(A)+R(B),XS(a)
      • S(a);OGATE::R(B),XP(c)
      • S(a);N_GUARD::R(B),XS(a)
      • P(e);OGATE::P(C),XP(e)
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