MESON Chess Problem Database

Problem Display
PID: 184167 (4r1Rb/6nq/B4Q2/7p/5p2/p2N3p/8/KR1N1k1b w - - 0 1)

Stubbs, Arthur Goodwin

Watney, Charles Gold

The Observer, 1927

(First published on Sat Oct 22 1927)

4r1Rb/6nq/B4Q2/7p/5p2/p2N3p/8/KR1N1k1b

#2

7 + 10

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Re2
      • 2.Se3#
    • 1...Se6
      • 2.Sc3#
  • Tries
    • 1.Qb2?
      • threat
        • 2.Se3#
        • 2.Qf2#
      • 1...Kg1
        • 2.Se3#
        • 2.Qf2#
      • 1...Re2
        • 2.Se3#
      • 1...Re1
        • 2.Qf2#
      • 1...Re3
        • 2.Sxe3#
        • 2.Qf2#
      • 1...Sf5
        • 2.Se3#
      • 1...Se6
        • 2.S1f2#
        • 2.Sc3#
        • 2.Se3#
      • 1...axb2+!
    • 1.Qxf4+?
      • 1...Kg1
        • 2.Se3#
        • 2.Qf2#
      • 1...Ke2
        • 2.Sc3#
        • 2.Qf2#
      • 1...Kg2
        • 2.Qf2#
      • 1...Bf3!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Qf2#
      • 1...Sf5+
        • 2.Se5#
      • 1...Se6+
        • 2.Sc3#
      • 1...Kg1
        • 2.Qf2#
      • 1...Ke2
        • 2.Qf2#
      • 1...Kg2
        • 2.Qf2#
      • 1...Re2
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(i);SBLOCK::R(B)+S(C),DCHECK
    • S(g);P_PINQ(F),S_CUTR(i)::R(B)+S(C)
  • Tries
    • Try
      • Q(F);N_PINP(e)
      • Threat
        • DUALS(2)
      • Vars
        • R(i);::R(B)+S(C),DCHECK
        • R(i);::QAR1(F)
        • S(g);P_PINQ(F)::R(B)+S(C),DCHECK
      • Refutation
        • P(c);CHECK,XQ(F)
    • Try
      • Q(F);CHECK,XP(e)
      • Vars
        • K(a);P_SPINS(g),S_FLIGHT::QAR1(F)
      • Refutation
        • B(b);P_SPINB(b)
  • Actual
    • Q(F);N_PINP(e)
    • Threat
      • QAR1(F)
    • Vars
      • S(g);CHECK,S_CUTQ(h)::B(E)+S(D)
      • S(g);CHECK,S_CUTR(i)::R(B)+S(C)
      • K(a);P-FLIGHT,P_SPINS(g)::QAB1(F)
      • K(a);S_FLIGHT::QAR1(F)
      • K(a);P_SPINS(g),S_FLIGHT::QAR1(F)
      • R(i);SBLOCK::R(B)+S(C),DCHECK
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