MESON Chess Problem Database

Problem Display
PID: 206253 (8/b1n5/4Q3/2prp3/2k4K/1pNNp3/1n2B3/2RR4 w - - 0 1)

Eddy, Edwin John

Il Problema, 1931

8/b1n5/4Q3/2prp3/2k4K/1pNNp3/1n2B3/2RR4

#2

7 + 9

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Sxb2#
    • 1...Sb5
      • 2.Qxd5#
    • 1...Sa6
      • 2.Qxd5#
    • 1...Sa8
      • 2.Qxd5#
    • 1...Se8
      • 2.Qxd5#
  • Tries
    • 1.Sxd5+?
      • 1...Kd4
        • 2.Qxe5#
      • 1...Kb5!
    • 1.Qa6+?
      • 1...Kd4
        • 2.Sxb2#
      • 1...Sb5
        • 2.Sxb5#
      • 1...Sxa6!
  • Keys
    • 1.Qc6!
      • threat
        • 2.Sb5#
      • 1...Rd4+
        • 2.Se4#
      • 1...Kd4
        • 2.Sxb2#
      • 1...Rxd3
        • 2.Qe4#
      • 1...Sxd1
        • 2.Qa4#
      • 1...Sxd3
        • 2.Qa4#
      • 1...Sa4
        • 2.Qxa4#
      • 1...Sb5
        • 2.Sxb5#
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • K(d);N_SPINR(f),P-FLIGHT::R(B)+S(E),XS(a)
    • S(i);N_GUARD::QAB1(G),XR(f)
  • Tries
    • Try
      • S(D);CHECK,XR(f)
      • Vars
        • K(d);P-FLIGHT::QAB1(G),XP(g)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(G);CHECK,N_PINR(f)
      • Vars
        • K(d);P-FLIGHT::R(B)+S(E),XS(a)
        • S(i);P_SPINS(i)::R(A)+S(D),XS(i)
      • Refutation
        • S(i);XQ(G)
  • Actual
    • Q(G);N_PINR(f),P_PINP(e)
    • Threat
      • R(A)+S(D)
    • Vars
      • R(f);CHECK,SBLOCK::R(A)+S(D)
      • K(d);N_SPINP(e),P-FLIGHT::R(B)+S(E),XS(a)
      • R(f);OGATE,P_SPINR(f),XS(E)::QAR2(G)
      • S(a);N_GUARD,XR(B)::QAR2(G)
      • S(a);N_GUARD,P_SPINS(a),XS(E)::QAR2(G)
      • S(a);N_GUARD::QAR2(G),XS(a)
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