MESON Chess Problem Database

Problem Display
PID: 101006 (8/8/8/4Q3/2K1B1p1/1N4B1/2Npkp2/8 w - - 0 1)

Heydon, Joseph Kentigern

Good Companions, 1920

8/8/8/4Q3/2K1B1p1/1N4B1/2Npkp2/8

#2

6 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...d1Q
      • 2.Bg2#
    • 1...d1B
      • 2.Bg2#
    • 1...d1R
      • 2.Bg2#
  • Tries
    • 1.Bd3+?
      • 1...Kd1
        • 2.Qa1#
        • 2.Qe2#
      • 1...Kf3!
    • 1.Qd4?
      • 1...Kd1
        • 2.Qxd2#
      • 1...Kf1
        • 2.Qxf2#
      • 1...d1Q
        • 2.Qxf2#
      • 1...d1S
        • 2.Qd3#
      • 1...d1B
        • 2.Qxf2#
        • 2.Qd3#
      • 1...d1R
        • 2.Qxf2#
      • 1...f1Q
        • 2.Qxd2#
      • 1...f1B
        • 2.Qxd2#
      • 1...f1R
        • 2.Qxd2#
      • 1...f1S!
  • Keys
    • 1.Qf4!
      • 1...Kd1
        • 2.Qxd2#
        • 2.Qxg4#
      • 1...Kf1
        • 2.Qxf2#
      • 1...d1Q
        • 2.Qxf2#
      • 1...d1S
        • 2.Bd3#
      • 1...d1B
        • 2.Bd3#
        • 2.Qxf2#
      • 1...d1R
        • 2.Qxf2#
      • 1...f1Q
        • 2.Qxd2#
      • 1...f1S
        • 2.Qxg4#
      • 1...f1B
        • 2.Qxd2#
        • 2.Qxg4#
      • 1...f1R
        • 2.Qxd2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • P(a);SBLOCK::QAR(F)+B(E)
  • Tries
    • Try
      • B(E);CHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(F);
      • Vars
        • K(b);P_SPINP(a),S_FLIGHT::QAR1(F),XP(a)
        • K(b);S_FLIGHT::QAR1(F),XP(c)
        • P(a);SBLOCK::QAR1(F),XP(c)
        • P(a);::QAB1(F)
        • P(c);SBLOCK::QAR1(F),XP(a)
      • Refutation
        • P(c);
  • Actual
    • Q(F);
    • Vars
      • K(b);P_SPINP(c),S_FLIGHT::QAR1(F),XP(c)
      • P(a);SBLOCK::QAR1(F),XP(c)
      • P(a);SBLOCK::B(E)
      • P(c);SBLOCK::QAR1(F),XP(a)
      • P(c);SBLOCK::QAB(F),XP(d)
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