MESON Chess Problem Database

Problem Display
PID: 224113 (7K/5bp1/7k/2Q5/8/3B2N1/8/8 w - - 0 1)

Nielsen, Villy Charles Esbjorn

Arbejder-Skak, 1940

7K/5bp1/7k/2Q5/8/3B2N1/8/8

#2

4 + 3

2048 Tuxens skakopgaver (Leif C Schmidt) 1984
5454 Near Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ba2
      • 2.Qh5#
    • 1...Bb3
      • 2.Qh5#
    • 1...Bc4
      • 2.Qh5#
    • 1...Bh5
      • 2.Qxh5#
    • 1...Be6
      • 2.Qh5#
    • 1...Bg6
      • 2.Qe3#
      • 2.Qc1#
    • 1...Bg8
      • 2.Qh5#
    • 1...g5
      • 2.Qf8#
  • Tries
    • 1.Se4?
      • threat
        • 2.Qg5#
      • 1...Kg6
        • 2.Qg5#
      • 1...g5
        • 2.Qxg5#
      • 1...Bd5!
    • 1.Qd4?
      • threat
        • 2.Qxg7#
      • 1...Bg6
        • 2.Qe3#
        • 2.Qf4#
      • 1...g5
        • 2.Qg7#
      • 1...g6
        • 2.Qh4#
      • 1...Kg5!
    • 1.Qf8?
      • threat
        • 2.Qxg7#
      • 1...Bg6
        • 2.Qf4#
      • 1...Kg5!
    • 1.Qe5?
      • threat
        • 2.Qxg7#
      • 1...Bg6
        • 2.Qf4#
        • 2.Qe3#
      • 1...g5
        • 2.Qg7#
      • 1...g6!
  • Keys
    • 1.Qe7!
      • 1...Be8
        • 2.Qxg7#
      • 1...Ba2
        • 2.Qh4#
        • 2.Qxg7#
      • 1...Bb3
        • 2.Qh4#
        • 2.Qxg7#
      • 1...Bc4
        • 2.Qh4#
        • 2.Qxg7#
      • 1...Bd5
        • 2.Qh4#
        • 2.Qxg7#
      • 1...Bh5
        • 2.Qxg7#
      • 1...Be6
        • 2.Qh4#
        • 2.Qxg7#
      • 1...Bg6
        • 2.Qe3#
      • 1...Bg8
        • 2.Qh4#
        • 2.Qxg7#
      • 1...g5
        • 2.Qf8#
      • 1...g6
        • 2.Qh4#

This anticipates 23125(1996), 178564(2010)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • B(b);N_GUARD::QAR1(C)
    • B(b);N_GUARD::QAR1(C),XB(b)
    • P(c);OGATEB,SBLOCK::QAB(C)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAB1(C)
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
        • P(c);::QAB1(C),XP(c)
      • Refutation
        • B(b);
    • Try
      • Q(C);
      • Threat
        • QAB1(C),XP(c)
      • Vars
        • P(c);::QAB1(C)
        • P(c);S_CUTB(b)::QAR2(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);P_PINP(c)
      • Threat
        • QAB1(C),XP(c)
      • Vars
        • B(b);OGATE::QAB(C)
      • Refutation
        • K(a);N_SPINP(c),S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB1(C),XP(c)
      • Vars
        • P(c);::QAB1(C)
      • Refutation
        • P(c);
  • Actual
    • Q(C);
    • Vars
      • B(b);OGATE::QAB1(C),XP(c)
      • B(b);S_CUTP(c)::QAB(C)
      • P(c);OGATEB,SBLOCK::QAB(C)
      • P(c);S_CUTB(b)::QAR2(C)
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