MESON Chess Problem Database

Problem Display
PID: 87504 (6N1/4p3/2K1k1PP/2RN2Q1/2P1q3/5p2/8/8 w - - 0 1)

Eddy, Edwin John

The Problemist, 1930

6N1/4p3/2K1k1PP/2RN2Q1/2P1q3/5p2/8/8

#2

8 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.Sf4#
      • 2.Sc7#
    • 1...Qc2
      • 2.Sf4#
      • 2.Sc7#
    • 1...Qd3
      • 2.Sf4#
      • 2.Sc7#
    • 1...Qxd5+
      • 2.Qxd5#
      • 2.cxd5#
    • 1...Qf5
      • 2.Sc7#
      • 2.Qxe7#
    • 1...Qe1
      • 2.Sf4#
      • 2.Sc7#
    • 1...Qe2
      • 2.Sf4#
      • 2.Sc7#
    • 1...Qe3
      • 2.Sc7#
    • 1...Qxc4
      • 2.Sc7#
    • 1...Qd4
      • 2.Sc7#
    • 1...Qf4
      • 2.Sxf4#
    • 1...Qg4
      • 2.Sc7#
    • 1...Qh4
      • 2.Sc7#
  • Tries
    • 1.Qg4+?
      • 1...Qf5
        • 2.Sf4#
        • 2.Sc7#
      • 1...Qxg4
        • 2.Sc7#
      • 1...Ke5!
    • 1.Qf5+?
      • 1...Qxf5
        • 2.Sc7#
      • 1...Kxf5!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Qxe4#
      • 1...Qxd5+
        • 2.cxd5#
      • 1...Qxg6
        • 2.Sc7#
      • 1...Qxc4
        • 2.Sc7#
      • 1...Qxf4
        • 2.Sxf4#
      • 1...Qe5
        • 2.Qf7#
      • 1...Qb1
        • 2.Sc7#
      • 1...Qc2
        • 2.Sc7#
      • 1...Qd3
        • 2.Sc7#
      • 1...Qf5
        • 2.Sc7#
      • 1...Qe1
        • 2.Sc7#
      • 1...Qe2
        • 2.Sc7#
      • 1...Qe3
        • 2.Sc7#
      • 1...Qd4
        • 2.Sc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 2
  • Sets
    • Q(b);N_PINS(C)::S(C)
    • Q(b);N_PINS(C),P_PINR(B),XP(A)::S(C)
    • Q(b);N_PINS(C)::S(C),XQ(b)
  • Tries
    • Try
      • Q(D);CHECK
      • Vars
        • Q(b);N_PINS(C),XQ(D)::S(C)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • Q(b);N_PINS(C),XQ(D)::S(C)
      • Refutation
        • K(c);S_FLIGHT,XQ(D)
  • Actual
    • Q(D);
    • Threat
      • QAR2(D),XQ(b)
    • Vars
      • Q(b);CHECK,OGATE,XS(C)::P(A),XQ(b)
      • Q(b);N_PINS(C),XP(F)::S(C)
      • Q(b);N_PINS(C),P_PINR(B),XP(A)::S(C)
      • Q(b);N_PINS(C),XQ(D)::S(C),XQ(b)
      • Q(b);N_PINS(C),SBLOCK::QAB1(D)
      • Q(b);N_PINS(C)::S(C)
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