MESON Chess Problem Database

Problem Display
PID: 138000 (4Q3/8/r2p4/3P4/R1Pk2K1/p4p2/3N4/2qRN3 w - - 0 1)

Ellerman, Arnoldo

British Chess Magazine, 1926

4Q3/8/r2p4/3P4/R1Pk2K1/p4p2/3N4/2qRN3

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Qh8#
    • 1...Kc5
      • 2.Qe3#
    • 1...Qc3
      • 2.Sb3#
  • Tries
    • 1.Sf1+?
      • 1...Kc5
        • 2.Qb5#
      • 1...Qd2
        • 2.Qe3#
      • 1...Qxd1
        • 2.Qe3#
      • 1...Kc3!
    • 1.Sdxf3+?
      • 1...Kc5
        • 2.Qb5#
      • 1...Kc3!
    • 1.Rxc1?
      • threat
        • 2.Sb3#
      • 1...Kc5
        • 2.Qe3#
      • 1...Rb6!
    • 1.Qe4+?
      • 1...Kc5
        • 2.Qe3#
      • 1...Kc3!
  • Keys
    • 1.Kf4!
      • threat
        • 2.Qe3#
      • 1...Kc3
        • 2.Qh8#
      • 1...Kc5
        • 2.Qe3#
      • 1...Qxc4
        • 2.Se4#
      • 1...Qc3
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(d);S_FLIGHT::QAB(H)
    • Q(a);SBLOCK::R(A)+S(C),DCHECK
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(d);S_FLIGHT::QAR1(H)
        • Q(a);P_SPINQ(a)::QAB1(H)
        • Q(a);XR(A)::QAB1(H)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • S(C);CHECK,XP(c)
      • Vars
        • K(d);S_FLIGHT::QAR1(H)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • R(A);XQ(a)
      • Threat
        • S(C)
      • Vars
        • K(d);S_FLIGHT::QAB(H)
      • Refutation
        • R(e);
    • Try
      • Q(H);CHECK
      • Vars
        • K(d);S_FLIGHT::QAB(H)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • K(F);P-FLIGHT,P_SPINS(C)
    • Threat
      • QAB1(H)
    • Vars
      • K(d);S_FLIGHT::QAB(H)
      • Q(a);N_PINS(C),P_SPINQ(a),XP(E)::R(A)+S(C)
      • Q(a);N_PINS(C),SBLOCK::R(A)+S(C),DCHECK
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