MESON Chess Problem Database

Problem Display
PID: 4877 (8/6K1/8/4kp2/1Q6/8/B2PnP2/8 w - - 0 1)

Ohquist, Johannes

Shakhmatny Zhurnal, 1892

8/6K1/8/4kp2/1Q6/8/B2PnP2/8

#2

5 + 3

3360 Simple Two-move Themes 1924
5501 Chess Cameos 1936
3310 2345 Chess Problems 1997
5424 Versunkene Schatze 1998
5454 Near Snap 2007
5454 Near Snap 2010
3713 Snap 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Sc1
      • 2.f4#
    • 1...Sg1
      • 2.f4#
    • 1...Sc3
      • 2.f4#
    • 1...Sg3
      • 2.f4#
  • Tries
    • 1.Qc5+?
      • 1...Ke4
        • 2.Qe3#
      • 1...Kf4!
    • 1.Qe7+?
      • 1...Kd4
        • 2.Qe3#
      • 1...Kf4!
    • 1.d3?
      • 1...Sd4
        • 2.Qb8#
      • 1...f4
        • 2.Qc5#
      • 1...Sc1
        • 2.f4#
      • 1...Sg1
        • 2.f4#
      • 1...Sc3
        • 2.f4#
      • 1...Sg3
        • 2.f4#
      • 1...Sf4!
  • Keys
    • 1.f3!
      • 1...Sd4
        • 2.Qb8#
      • 1...f4
        • 2.Qc5#
      • 1...Sc1
        • 2.f4#
      • 1...Sg1
        • 2.f4#
      • 1...Sc3
        • 2.f4#
      • 1...Sg3
        • 2.f4#
      • 1...Sf4
        • 2.d4#

This anticipates 143573(1895), 178120(1900), 49145(1906), 16389(1940), 96887(1945), 24689(1987)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::P(C)
  • Tries
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(D)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAB1(D)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • P(B);
      • Vars
        • S(a);SBLOCK::QAB(D)
        • P(c);SBLOCK::QAR2(D)
        • S(a);N_GUARD::P(C)
      • Refutation
        • S(a);
  • Actual
    • P(C);
    • Vars
      • S(a);SBLOCK::QAB(D)
      • P(c);SBLOCK::QAR2(D)
      • S(a);N_GUARD::P(C)
      • S(a);N_GUARD,SBLOCK::P(B)
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