MESON Chess Problem Database

Problem Display
PID: 43751 (4R3/2Q5/3PB1R1/2prkr2/K4p2/n2p2n1/3N2N1/8 w - - 0 1)

Eddy, Edwin John

De Problemist, 1930

4R3/2Q5/3PB1R1/2prkr2/K4p2/n2p2n1/3N2N1/8

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rd4+
      • 2.Bc4#
    • 1...Se4
      • 2.Sf3#
  • Tries
    • 1.Bxf5+?
      • 1...Kxf5
        • 2.Sh4#
        • 2.Qf7#
      • 1...Kd4!
    • 1.Qxc5?
      • threat
        • 2.Bxd5#
        • 2.Bd7#
        • 2.Bf7#
        • 2.Bc8#
        • 2.Bg8#
        • 2.Qxd5#
      • 1...Rg5
        • 2.Bh3#
        • 2.Bg4#
        • 2.Bd7#
        • 2.Bc8#
        • 2.Qxd5#
      • 1...Rh5
        • 2.Bh3#
        • 2.Bg4#
        • 2.Bd7#
        • 2.Bc8#
        • 2.Qxd5#
      • 1...Rf6
        • 2.Qxd5#
      • 1...Rf7
        • 2.Qxd5#
      • 1...Rf8
        • 2.Qxd5#
      • 1...Rxc5!
    • 1.Qc6?
      • threat
        • 2.Qxd5#
      • 1...Rd4+
        • 2.Bc4#
      • 1...Rxd6
        • 2.Sf3#
      • 1...Kd4!
    • 1.Qg7+?
      • 1...Kxd6
        • 2.Bxf5#
      • 1...Rf6!
  • Keys
    • 1.Qb7!
      • threat
        • 2.Qxd5#
      • 1...Rd4+
        • 2.Bc4#
      • 1...Kd4
        • 2.Qb2#
      • 1...Kxd6
        • 2.Bxf5#
      • 1...Rxd6
        • 2.Sf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(f);CHECK,OGATE,SBLOCK::R(H)+B(E)
    • S(c);SBLOCK::S(A)
  • Tries
    • Try
      • B(E);CHECK,XR(h)
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • Q(G);P_PINR(f),XP(e)
      • Threat
        • DUALS(6)
      • Vars
        • R(h);::QAR1(G),XR(f)
      • Refutation
        • R(f);N_SPINR(f),XQ(G)
    • Try
      • Q(G);
      • Threat
        • QAR1(G),XR(f)
      • Vars
        • R(f);CHECK,OGATE,SBLOCK::R(H)+B(E)
        • R(f);XP(D)::S(A)
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • Q(G);CHECK
      • Vars
        • K(g);S_FLIGHT,XP(D)::R(F)+B(E),XR(h)
      • Refutation
        • R(h);P_SPINR(h)
  • Actual
    • Q(G);
    • Threat
      • QAR1(G),XR(f)
    • Vars
      • R(f);CHECK,OGATE,SBLOCK::R(H)+B(E)
      • K(g);S_FLIGHT::QAB(G)
      • K(g);S_FLIGHT,XP(D)::R(F)+B(E),XR(h)
      • R(f);SBLOCK,XP(D)::S(A)
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