MESON Chess Problem Database

Problem Display
PID: 163600 (2b5/K1p1p3/p6b/3k1r1R/PB1N2Q1/1P1r1N2/3R2B1/8 w - - 0 1)

Sumner, Christopher Richard Benson

The Observer, 1925

(First published on Sun Oct 4 1925)

2b5/K1p1p3/p6b/3k1r1R/PB1N2Q1/1P1r1N2/3R2B1/8

#2

10 + 8

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Re5
      • 2.Rxe5#
  • Tries
    • 1.Sg5+?
      • 1...Rdf3
        • 2.Qe4#
      • 1...Rff3
        • 2.Qe4#
      • 1...Ke5!
    • 1.Rxf5+?
      • 1...e5
        • 2.Rxe5#
      • 1...Bxf5!
    • 1.Qxf5+?
      • 1...e5
        • 2.Qxe5#
      • 1...Bxf5!
  • Keys
    • 1.Sc6!
      • threat
        • 2.Qc4#
      • 1...Be3+
        • 2.Sfd4#
      • 1...Kxc6
        • 2.Se5#
      • 1...Ke6
        • 2.Qxf5#
      • 1...Bf4
        • 2.Sg5#
      • 1...Rd4
        • 2.Sfxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • R(c);OGATE::R1(I),XR(c)
  • Tries
    • Try
      • S(D);CHECK,N_PINR(c)
      • Vars
        • R(a);P_SPINR(a)::QAB1(H)
        • R(c);P_SPINR(c)::QAB1(H)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • R(I);CHECK,XR(c)
      • Vars
        • P(g);P_SPINP(g)::R1(I),XP(g)
      • Refutation
        • B(h);XR(I)
    • Try
      • Q(H);CHECK,XR(c)
      • Vars
        • P(g);P_SPINP(g)::QAR1(H),XP(g)
      • Refutation
        • B(h);P_SPINB(h),XQ(H)
  • Actual
    • S(G);N_PINR(c),P_PINR(a)
    • Threat
      • QAB1(H)
    • Vars
      • B(e);CHECK::B(B)+S(D)
      • K(b);N_SPINR(a),S_FLIGHT,XS(G)::B(B)+S(D),DCHECK
      • K(b);N_SPINR(a),P_SPINR(c),S_FLIGHT::QAB1(H),XR(c)
      • B(e);S_CUTR(c)::B(B)+S(D)
      • R(a);N_GUARD::B(B)+S(D),XR(a)
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