MESON Chess Problem Database

Problem Display
PID: 180268 (8/B3P3/2N1Q3/8/5K2/3P1P2/3Pb1P1/R2nkNR1 w - - 0 1)

Lider, Valentin Viktorovich

Schach, 1974

8/B3P3/2N1Q3/8/5K2/3P1P2/3Pb1P1/R2nkNR1

#2

12 + 3

23 Die Schwalbe 1974
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Ke4?
      • 1...Bxd3+
        • 2.Kxd3#
      • 1...Bxf3+
        • 2.Kxf3#
      • 1...Bxf1!
    • 1.Se3+?
      • 1...Kf2
        • 2.Sxd1#
        • 2.Sg4#
      • 1...Bf1
        • 2.Sxf1#
        • 2.Sc4#
      • 1...Kxd2!
    • 1.Qa2?
      • 1...Bxf1
        • 2.e8Q#
        • 2.e8R#
      • 1...Bxf3
        • 2.Sg3#
      • 1...Bxd3!
    • 1.Qb3?
      • 1...Bxf1
        • 2.Qxd1#
      • 1...Bxd3
        • 2.Qxd1#
      • 1...Bxf3!
  • Keys
    • 1.Se5!
      • 1...Bxf1
        • 2.Sc4#
      • 1...Bxd3
        • 2.Sxd3#
      • 1...Bxf3
        • 2.Sxf3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(H);N_PINB(c),P-FLIGHT
      • Vars
        • B(c);CHECK,XP(F)::QAR(J)+K(H),XB(c)
        • B(c);CHECK,XP(G)::QAR(J)+K(H),XB(c)
      • Refutation
        • B(c);P_SPINB(c),XS(B)
    • Try
      • S(B);CHECK,N_PINB(c)
      • Refutation
        • K(b);N_SPINS(a),S_FLIGHT,XP(D)
    • Try
      • Q(J);N_PINB(c)
      • Vars
        • B(c);P_SPINB(c),XS(B)::P=Q
        • B(c);N_GUARD,XP(G)::R(C)+S(B)
      • Refutation
        • B(c);XP(F)
    • Try
      • Q(J);N_PINB(c)
      • Vars
        • B(c);N_GUARD,P_SPINB(c),XS(B)::QAR1(J),XS(a)
        • B(c);N_GUARD,XP(F)::QAR1(J),XS(a)
      • Refutation
        • B(c);XP(G)
  • Actual
    • S(I);N_PINB(c)
    • Vars
      • B(c);P_SPINB(c),XS(B)::QAR(J)+S(I)
      • B(c);XP(F)::QAR(J)+S(I),DCHECK,XB(c)
      • B(c);XP(G)::QAR(J)+S(I),DCHECK,XB(c)
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