MESON Chess Problem Database

Problem Display
PID: 94874 (4k3/1N1pbp1N/8/8/4B3/1K5Q/8/8 w - - 0 1)

Rasmussen, Knud AK

Magasinet, 1950

4k3/1N1pbp1N/8/8/4B3/1K5Q/8/8

#2

5 + 4

6490 yacpdb 2009
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...d6
      • 2.Bc6#
    • 1...f5
      • 2.Qh5#
    • 1...f6
      • 2.Bg6#
      • 2.Qh5#
  • Tries
    • 1.Sf6+?
      • 1...Kf8
        • 2.Qh6#
        • 2.Qh8#
      • 1...Bxf6!
    • 1.Bc6?
      • threat
        • 2.Bxd7#
        • 2.Qxd7#
      • 1...Ba3
        • 2.Qxd7#
      • 1...Bb4
        • 2.Qxd7#
      • 1...Bh4
        • 2.Qxd7#
      • 1...Bc5
        • 2.Qxd7#
      • 1...Bg5
        • 2.Qxd7#
      • 1...Bd6
        • 2.Qxd7#
      • 1...Bf6
        • 2.Qxd7#
      • 1...Bd8
        • 2.Qxd7#
      • 1...Bf8
        • 2.Qxd7#
      • 1...f5
        • 2.Qh5#
      • 1...f6
        • 2.Qh5#
      • 1...dxc6!
  • Keys
    • 1.Qe6!
      • 1...dxe6
        • 2.Bc6#
      • 1...fxe6
        • 2.Bg6#
      • 1...d5
        • 2.Qc6#
      • 1...d6
        • 2.Bc6#
      • 1...f5
        • 2.Qg6#
      • 1...f6
        • 2.Bg6#

Anticipated by 161477(1945)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATEB::B(C)
    • P(c);OGATEB::QAB(B)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • B(b);XS(E)
    • Try
      • B(C);P_PINP(a)
      • Threat
        • DUALS(2)
      • Vars
        • B(b);::QAB1(B),XP(a)
        • P(c);OGATEB::QAB(B)
      • Refutation
        • P(a);N_SPINP(a),XB(C)
  • Actual
    • Q(B);P_PINB(b)
    • Vars
      • P(a);N_SPINB(b),OGATEB,XQ(B)::B(C)
      • P(c);N_SPINB(b),OGATEB,XQ(B)::B(C)
      • P(a);OGATEB::QAB(B)
      • P(a);OGATEB::B(C)
      • P(c);OGATEB::QAB(B)
      • P(c);OGATEB::B(C)
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