MESON Chess Problem Database

Problem Display
PID: 117343 (8/B2Q3B/2PPP3/K2k2p1/pP3pP1/Np1N1p2/1Pn2P2/2RR4 w - - 0 1)

Lehen, Ludovit

Valuska, Jan

Canadian Chess Chat, 1982

8/B2Q3B/2PPP3/K2k2p1/pP3pP1/Np1N1p2/1Pn2P2/2RR4

#2

15 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sd4
      • 2.Rc5#
  • Tries
    • 1.Sc4?
      • 1...Kxc4
        • 2.Se5#
      • 1...Sxb4
        • 2.Sxb4#
        • 2.Sxf4#
      • 1...Sa1
        • 2.Se1#
        • 2.Sxf4#
        • 2.Sc5#
        • 2.Sde5#
      • 1...Se1
        • 2.Sxe1#
        • 2.Sxf4#
      • 1...Sa3
        • 2.Se1#
        • 2.Sxf4#
        • 2.Sc5#
        • 2.Sde5#
      • 1...Se3
        • 2.Sxf4#
      • 1...Sd4
        • 2.Sb6#
      • 1...a3!
    • 1.Sb5?
      • 1...Kc4
        • 2.Se5#
      • 1...Sxb4
        • 2.Sc7#
        • 2.Rc5#
      • 1...Sa1
        • 2.Sc7#
        • 2.Rc5#
      • 1...Se1
        • 2.Sc7#
        • 2.Rc5#
      • 1...Sa3
        • 2.Sc7#
        • 2.Rc5#
      • 1...Se3
        • 2.Sc7#
        • 2.Rc5#
      • 1...Sd4
        • 2.Sc7#
        • 2.Rc5#
      • 1...a3!
    • 1.Se1+?
      • 1...Sd4
        • 2.Rc5#
      • 1...Ke5!
    • 1.Sc5+?
      • 1...Ke5
        • 2.Qg7#
      • 1...Sd4!
    • 1.Se5+?
      • 1...Sd4
        • 2.Rc5#
      • 1...Kxe5!
  • Keys
    • 1.Qg7!
      • 1...Kxc6
        • 2.Se5#
      • 1...Kxd6
        • 2.Qd7#
      • 1...Kxe6
        • 2.Sc5#
      • 1...Sxa3
        • 2.Sxf4#
        • 2.Qe5#
      • 1...Sxb4
        • 2.Sxf4#
        • 2.Qe5#
      • 1...Sa1
        • 2.Sxf4#
        • 2.Qe5#
      • 1...Se1
        • 2.Sxf4#
        • 2.Qe5#
      • 1...Se3
        • 2.Sxf4#
        • 2.Qe5#
      • 1...Sd4
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(a);OGATE,SBLOCK::R1(A)
  • Tries
    • Try
      • S(E);
      • Vars
        • K(f);P_SPINS(a),S_FLIGHT,XS(E)::S(F)
        • S(a);::R(B)+S(F),DCHECK,XP(e)
        • S(a);SBLOCK::S(E)
      • Refutation
        • P(d);
    • Try
      • S(E);
      • Vars
        • K(f);P_SPINS(a),S_FLIGHT::S(F)
      • Refutation
        • P(d);
    • Try
      • S(F);CHECK
      • Vars
        • S(a);OGATE,P_SPINS(a)::R1(A)
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • K(f);P-FLIGHT::QAB(N)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • S(F);CHECK
      • Vars
        • S(a);OGATE,P_SPINS(a)::R1(A)
      • Refutation
        • K(f);P-FLIGHT,XS(F)
  • Actual
    • Q(N);
    • Vars
      • K(f);P_SPINS(a),S_FLIGHT,XP(J)::S(F)
      • K(f);OGATEB,P-FLIGHT,XP(K)::QAR1(N)
      • K(f);S_FLIGHT,XP(L)::S(F)
      • S(a);::QAR1(N)
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