MESON Chess Problem Database

Problem Display
PID: 139045 (8/4Q1N1/K2p3r/N2p3p/p1pkP1nR/2R1p3/1P6/8 w - - 0 1)

Eddy, Edwin John

The Problemist, 1937

8/4Q1N1/K2p3r/N2p3p/p1pkP1nR/2R1p3/1P6/8

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Se5
      • 2.Qa7#
  • Tries
    • 1.Sb3+?
      • 1...cxb3
        • 2.Sf5#
      • 1...axb3!
    • 1.Qa7+?
      • 1...Kxe4
        • 2.Qxe3#
      • 1...Ke5!
  • Keys
    • 1.Qg5!
      • threat
        • 2.Qxd5#
      • 1...Kxe4
        • 2.Qxe3#
      • 1...Kc5
        • 2.Rxc4#
      • 1...dxe4
        • 2.Sc6#
      • 1...Se5
        • 2.Qxe3#
      • 1...Sf6
        • 2.Se6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(e);SBLOCK::QAB(G)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • P(c);XS(E)::S(H)
      • Refutation
        • P(b);XS(E)
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);OGATE,P-FLIGHT,P_SPINS(e),XP(C)::QAR1(G),XP(a)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • Q(G);
    • Threat
      • QAR1(G),XP(f)
    • Vars
      • K(d);P-FLIGHT,P_SPINS(e),XP(C)::QAR1(G),XP(a)
      • K(d);P_SPINP(c),S_FLIGHT::R1(B),XP(c)
      • P(f);SBLOCK,XP(C)::S(E)
      • S(e);N_GUARD,SBLOCK::QAB1(G),XP(a)
      • S(e);S_CUTR(i)::S(H)
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