MESON Chess Problem Database

Problem Display
PID: 276561 (K7/1Q1p4/7R/5k2/2N3pP/2n2b2/3B1R1b/8 w - - 0 1)

Easter, Norris

Western Morning News, 1926

(First published on Sat Sep 11 1926)

K7/1Q1p4/7R/5k2/2N3pP/2n2b2/3B1R1b/8

#2

7 + 6

15239 Valois Notebooks 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Se4
      • 2.Qxd7#
    • 1...Sd5
      • 2.Qb1#
    • 1...g3
      • 2.Qxf3#
    • 1...d5
      • 2.Qh7#
  • Tries
    • 1.Rxf3+?
      • 1...Bf4
        • 2.Rxf4#
      • 1...gxf3!
    • 1.Qxf3+?
      • 1...Bf4
        • 2.Qxf4#
      • 1...gxf3!
    • 1.Qd5+?
      • 1...Be5
        • 2.Sd6#
      • 1...Sxd5!
  • Keys
    • 1.Bg5!
      • threat
        • 2.Rf6#
      • 1...Sd5
        • 2.Qb1#
      • 1...g3
        • 2.Qxf3#
      • 1...d5
        • 2.Qh7#
      • 1...Be5
        • 2.Se3#
      • 1...Se4
        • 2.Qxd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(b);N_PINQ(F),SBLOCK::QAB(F),XP(f)
    • S(b);N_PINQ(F)::QAB(F)
    • P(d);N_GUARD,S_CUTB(a)::QAR2(F),XB(c)
    • P(f);N_PINQ(F)::QAB(F)
  • Tries
    • Try
      • R(B);CHECK,N_SPINQ(F),XB(c)
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::R1(B),XB(a)
      • Refutation
        • P(d);XR(B)
    • Try
      • Q(F);CHECK,N_SPINQ(F),XB(c)
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR1(F),XB(a)
      • Refutation
        • P(d);P_SPINP(d),XQ(F)
    • Try
      • Q(F);CHECK
      • Vars
        • B(a);::S(C)
      • Refutation
        • S(b);XQ(F)
  • Actual
    • B(A);
    • Threat
      • R1(E)
    • Vars
      • S(b);N_PINQ(F)::QAB(F)
      • P(d);N_GUARD,S_CUTB(a)::QAR2(F),XB(c)
      • P(f);N_PINQ(F)::QAB(F)
      • B(a);SBLOCK::S(C)
      • S(b);N_PINQ(F),SBLOCK::QAB(F),XP(f)
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