MESON Chess Problem Database

Problem Display
PID: 129812 (4K2k/4N1p1/4N2p/8/8/p7/b1Q5/8 w - - 0 1)

Bostrom, Ernst

Svedsky svaz, 1929

4K2k/4N1p1/4N2p/8/8/p7/b1Q5/8

#2

4 + 5

6490 yacpdb 2009
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Qc3?
      • threat
        • 2.Qxg7#
      • 1...Kh7
        • 2.Qxg7#
      • 1...Bxe6!
  • Keys
    • 1.Sg5!
      • threat
        • 2.Qh7#
      • 1...Bf7+
        • 2.Sxf7#
      • 1...hxg5
        • 2.Qh2#
      • 1...g6
        • 2.Qc3#
      • 1...Bb1
        • 2.Sf7#
      • 1...Bg8
        • 2.Sg6#

Anticipated by 95218(1912)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);P_PINP(d)
      • Threat
        • QAB1(A),XP(d)
      • Vars
        • K(e);N_SPINP(d),P-FLIGHT::QAR1(A),XP(d)
      • Refutation
        • B(a);XS(B)
  • Actual
    • S(B);
    • Threat
      • QAR1(A)
    • Vars
      • B(a);CHECK,N_GUARD::S(B),XB(a)
      • P(c);OGATEB,XS(B)::QAR(A)
      • P(d);OGATEB::QAB(A)
      • B(a);N_GUARD::S(B)
      • B(a);SBLOCK::S(C)
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