MESON Chess Problem Database

Problem Display
PID: 110119 (1R2qkNb/3P2nP/8/4N2B/8/8/3K4/8 w - - 0 1)

Kubbel, Leonid Ivanovich (AKA Kubbel, Karl Artur Leonid)

1st Prize, Niva, 1909

1R2qkNb/3P2nP/8/4N2B/8/8/3K4/8

#2

7 + 4

1829 The Theory of Pawn Promotion 1912
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.d8Q?
      • threat
        • 2.Sd7#
        • 2.Qf6#
        • 2.Qe7#
        • 2.Qd6#
      • 1...Qxd8+
        • 2.Sd7#
      • 1...Sxh5
        • 2.Qe7#
      • 1...Se6
        • 2.Qe7#
      • 1...Sf5!
  • Keys
    • 1.d8S!
      • 1...Qd7+
        • 2.Sxd7#
      • 1...Qxd8+
        • 2.Sd7#
      • 1...Qxh5
        • 2.Se6#
      • 1...Qxe5
        • 2.Se6#
      • 1...Sxh5
        • 2.Se6#
      • 1...Qg6
        • 2.Se6#
      • 1...Qf7
        • 2.Se6#
      • 1...Sf5
        • 2.Se6#
      • 1...Se6
        • 2.Sxe6#
      • 1...Qa4
        • 2.Se6#
      • 1...Qb5
        • 2.Se6#
      • 1...Qc6
        • 2.Se6#
      • 1...Qe6
        • 2.Sxe6#
      • 1...Qe7
        • 2.Se6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 14
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • P(D);
      • Threat
        • DUALS(4)
      • Vars
        • Q(b);CHECK,XQ(D)::S(B)
        • S(a);XB(C)::QAB1(D)
        • S(a);::QAB1(D)
      • Refutation
        • S(a);
  • Actual
    • P(D);N_PINQ(b)
    • Vars
      • Q(b);CHECK,N_GUARD::S(B),XQ(b)
      • Q(b);CHECK,N_GUARD,P_SPINQ(b),XS(D)::S(B)
      • Q(b);XB(C)::R(F)+S(D),DCHECK
      • Q(b);XS(B)::R(F)+S(D),DCHECK
      • S(a);N_GUARD,XB(C)::S(D)
      • Q(b);::R(F)+S(D),DCHECK
      • S(a);N_GUARD::S(D)
      • S(a);N_GUARD::S(D),XS(a)
      • Q(b);::R(F)+S(D),DCHECK,XQ(b)
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