MESON Chess Problem Database

Problem Display
PID: 120974 (8/6pp/1p5b/1Q4pk/4P2p/4N2p/7P/2K5 w - - 0 1)

Hellstrom, Ake

Source?, 1935

8/6pp/1p5b/1Q4pk/4P2p/4N2p/7P/2K5

#2

5 + 8

6490 yacpdb 2009
5454 Near Snap 2014

SOLUTION

  • SOUND
  • Tries
    • 1.Sg4?
      • 1...Kg6
        • 2.Qe8#
      • 1...g6
        • 2.Sf6#
      • 1...Kxg4!
    • 1.Qe2+?
      • 1...g4
        • 2.Qxg4#
      • 1...Kg6!
    • 1.Qf5?
      • 1...g6
        • 2.Qg4#
      • 1...b5!
  • Keys
    • 1.Sd5!
      • 1...g4+
        • 2.Sf4#
      • 1...Kg4
        • 2.Qe2#
      • 1...Kg6
        • 2.Qe8#
      • 1...g6
        • 2.Sf6#

Anticipated by 120005(1907)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);
      • Vars
        • K(d);N_SPINP(c),S_FLIGHT::QAB(E)
        • P(g);N_GUARD,SBLOCK::S(C)
      • Refutation
        • K(d);N_SPINP(c),S_FLIGHT,XS(C)
    • Try
      • Q(E);CHECK,N_PINP(c)
      • Vars
        • P(c);P_PINS(C),P_SPINP(c)::QAB1(E),XP(c)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(E);
      • Vars
        • P(g);SBLOCK::QAB1(E)
      • Refutation
        • P(e);
  • Actual
    • S(C);N_PINP(c)
    • Vars
      • P(c);CHECK,SBLOCK::QAR(E)+S(C),DCHECK
      • K(d);S_FLIGHT::QAB(E)
      • P(g);N_GUARD,SBLOCK::S(C)
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