MESON Chess Problem Database

Problem Display
PID: 120972 (8/8/1K4p1/8/3Nk3/2B2N2/5P2/5Q2 w - - 0 1)

Hellstrom, Ake

Source?, 1934

8/8/1K4p1/8/3Nk3/2B2N2/5P2/5Q2

#2

6 + 2

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Qe2+?
      • 1...Kd5
        • 2.Qe6#
      • 1...Kf4!
    • 1.Qb5?
      • 1...g5
        • 2.Qf5#
      • 1...Kf4!
    • 1.Qe1+?
      • 1...Kd3
        • 2.Se5#
      • 1...Kd5
        • 2.Qe6#
      • 1...Kf4!
  • Keys
    • 1.Qh3!
      • 1...Kd3
        • 2.Sd2#
      • 1...Kf4
        • 2.Qh4#
      • 1...Kd5
        • 2.Qe6#
      • 1...g5
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • P(b);N_GUARD::QAB1(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);S_FLIGHT::S(D)
        • K(a);OGATE,S_FLIGHT::QAB1(A)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(a);S_FLIGHT::QAR(A)+S(D)
      • K(a);P-FLIGHT::QAR2(A)
      • K(a);S_FLIGHT::QAB1(A)
      • P(b);N_GUARD::QAB1(A)
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