MESON Chess Problem Database

Problem Display
PID: 144809 (8/1N1Kp3/P2NP3/RPpkp3/2p1p3/2P1P3/3P4/3Q4 w - - 0 1)

Allen, Edgar William

Literary Digest, 1902

8/1N1Kp3/P2NP3/RPpkp3/2p1p3/2P1P3/3P4/3Q4

#2

11 + 6

119 Tidskrift for Schack 1909

SOLUTION

  • SOUND
  • Tries
    • 1.Qb3?
      • threat
        • 2.Qxc4#
      • 1...cxb3
        • 2.c4#
      • 1...exd6!
    • 1.Qf3?
      • threat
        • 2.Qxe4#
      • 1...exf3
        • 2.e4#
      • 1...exd6!
    • 1.d3?
      • threat
        • 2.dxc4#
        • 2.dxe4#
      • 1...cxd3
        • 2.c4#
      • 1...exd3
        • 2.e4#
      • 1...exd6!
  • Keys
    • 1.d4!
      • threat
        • 2.dxc5#
      • 1...cxd4
        • 2.b6#
      • 1...exd4
        • 2.Qh5#
      • 1...cxd4 ep
        • 2.c4#
      • 1...exd4 ep
        • 2.e4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);P_PINP(a)
      • Threat
        • QAB1(A),XP(a)
      • Vars
        • P(a);N_SPINP(a),OGATE,XQ(A)::P(C)
      • Refutation
        • P(f);XS(H)
    • Try
      • Q(A);P_PINP(b)
      • Threat
        • QAB1(A),XP(b)
      • Vars
        • P(b);N_SPINP(b),OGATE,XQ(A)::P(D)
      • Refutation
        • P(f);XS(H)
    • Try
      • P(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(a);OGATE,P_SPINP(a),XP(B)::P(C)
        • P(b);OGATE,P_SPINP(b),XP(B)::P(D)
      • Refutation
        • P(f);XS(H)
  • Actual
    • P(B);
    • Threat
      • QAR(A)+P(B),XP(c)
    • Vars
      • P(c);P_SPINP(c),XP(B)::R(E)+P(F)
      • P(e);OGATEB,P_SPINP(e),XP(B)::QAR(A)
      • P(a);EP,OGATE,P_SPINP(a),XP(B)::P(C)
      • P(b);EP,OGATE,P_SPINP(b),XP(B)::P(D)
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