MESON Chess Problem Database

Problem Display
PID: 4692 (4K3/8/N2p2N1/3k1P2/6B1/3nP3/8/1Q6 w - - 0 1)

Dobrusky, Jan

Ceske Ulohy Sachove, 1887

4K3/8/N2p2N1/3k1P2/6B1/3nP3/8/1Q6

#2

7 + 3

3360 Simple Two-move Themes 1924
5501 Chess Cameos 1936
3713 Snap 2018
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kc6
      • 2.Se7#
  • Tries
    • 1.Qc2?
      • threat
        • 2.Bf3#
      • 1...Se1
        • 2.Sb4#
        • 2.Sc7#
      • 1...Sf2
        • 2.Sb4#
        • 2.Sc7#
      • 1...Sc5
        • 2.Sb4#
      • 1...Se5
        • 2.Sb4#
        • 2.Sc7#
        • 2.Sf4#
        • 2.Se7#
      • 1...Ke4!
    • 1.Qb3+?
      • 1...Kc6
        • 2.Se7#
      • 1...Ke4!
    • 1.Qb5+?
      • 1...Sc5
        • 2.Bf3#
      • 1...Ke4!
  • Keys
    • 1.Be2!
      • 1...Kc4
        • 2.Qxd3#
      • 1...Ke4
        • 2.Qxd3#
      • 1...Kc6
        • 2.Se7#
      • 1...Sc1
        • 2.Qb7#
      • 1...Se1
        • 2.Qb7#
      • 1...Sb2
        • 2.Qh1#
      • 1...Sf2
        • 2.Qb7#
      • 1...Sb4
        • 2.Qh1#
      • 1...Sf4
        • 2.Qb7#
      • 1...Sc5
        • 2.Sb4#
      • 1...Se5
        • 2.Se7#

This anticipates 175635(1900), 189986(1913)

This is a version

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::S(F)
  • Tries
    • Try
      • Q(A);
      • Threat
        • B(C)
      • Vars
        • S(a);N_GUARD::S(E)
      • Refutation
        • K(b);P_SPINS(a),S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::S(F)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);P_SPINS(a)::B(C)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • B(C);
    • Vars
      • K(b);P_SPINS(a),S_FLIGHT::QAB1(A),XS(a)
      • K(b);S_FLIGHT::S(F)
      • S(a);::QAB(A)
      • S(a);N_GUARD,SBLOCK::S(E)
      • S(a);SBLOCK::S(F)
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