MESON Chess Problem Database

Problem Display
PID: 223660 (7Q/8/2K2p2/2N1k3/5p2/1P6/5P2/8 w - - 0 1)

Dahl, Anton M

Aftenposten, 1888

7Q/8/2K2p2/2N1k3/5p2/1P6/5P2/8

#2

5 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qxf6#
    • 1...Kf5
      • 2.Qh5#
  • Tries
    • 1.Qh1?
      • threat
        • 2.Qe4#
        • 2.Qd5#
      • 1...Kd4
        • 2.Qa1#
      • 1...Kf5
        • 2.Qh5#
      • 1...f5
        • 2.Qa1#
        • 2.Qh8#
      • 1...f3!
    • 1.Qh2?
      • 1...Kf5
        • 2.Qh5#
      • 1...f5
        • 2.Qh8#
      • 1...Kd4!
    • 1.Qh5+?
      • 1...f5
        • 2.Qh8#
      • 1...Kd4!
    • 1.Qh6?
      • 1...Kd4
        • 2.Qxf6#
      • 1...Kf5
        • 2.Qh5#
      • 1...f5
        • 2.Qg7#
        • 2.Qd6#
        • 2.Qh8#
      • 1...f3!
    • 1.Qh7?
      • threat
        • 2.Qe4#
      • 1...f5
        • 2.Qg7#
        • 2.Qh8#
      • 1...Kd4!
    • 1.Qe8+?
      • 1...Kf5
        • 2.Qh5#
      • 1...Kd4!
    • 1.f3?
      • 1...Kf5
        • 2.Qh5#
      • 1...Kd4!
  • Keys
    • 1.Qh4!
      • 1...Kd4
        • 2.Qxf6#
      • 1...Kf5
        • 2.Qh5#
      • 1...f3
        • 2.Qe4#
      • 1...f5
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::QAB(E),XP(c)
    • K(b);N_SPINP(c),P-FLIGHT::QAR2(E)
  • Tries
    • Try
      • Q(E);N_PINP(c)
      • Threat
        • DUALS(2)
      • Vars
        • K(b);S_FLIGHT::QAB(E)
        • K(b);P-FLIGHT::QAR2(E)
      • Refutation
        • P(a);
    • Try
      • Q(E);N_PINP(c),P_PINP(a)
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT::QAR2(E)
        • P(c);OGATEB,SBLOCK::QAB(E)
      • Refutation
        • K(b);N_SPINP(a),S_FLIGHT
    • Try
      • Q(E);CHECK,N_PINP(c)
      • Vars
        • P(c);OGATEB,P_SPINP(c),SBLOCK::QAB(E)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(E);N_PINP(c)
      • Vars
        • K(b);S_FLIGHT::QAB(E),XP(c)
        • K(b);P-FLIGHT::QAR2(E)
      • Refutation
        • P(a);
    • Try
      • Q(E);N_PINP(c)
      • Threat
        • QAR1(E)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(E);CHECK,N_PINP(c)
      • Vars
        • K(b);P-FLIGHT::QAR2(E)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • P(A);
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT::QAR2(E)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(E);N_PINP(c)
    • Vars
      • K(b);P_SPINP(a),S_FLIGHT::QAB(E),XP(c)
      • K(b);P-FLIGHT::QAR2(E)
      • P(a);OGATE::QAR1(E)
      • P(c);OGATEB,SBLOCK::QAB(E)
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