MESON Chess Problem Database

Problem Display
PID: 87788 (1N6/2P2N2/2q3pR/P1k1P3/2P1P3/2K5/8/8 w - - 0 1)

Ravishankar, SN

The Problemist, 1991

1N6/2P2N2/2q3pR/P1k1P3/2P1P3/2K5/8/8

#2

9 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...g5
      • 2.Rxc6#
  • Tries
    • 1.Sxc6?
      • 1...Kxc6
        • 2.c8Q#
      • 1...g5!
    • 1.c8Q?
      • threat
        • 2.Sa6#
        • 2.Sd7#
        • 2.Qxc6#
      • 1...Qc7
        • 2.Qxc7#
      • 1...Qxc8!
    • 1.c8R?
      • threat
        • 2.Sa6#
        • 2.Sd7#
        • 2.Rxc6#
      • 1...Qc7
        • 2.Rxc7#
      • 1...Qxc8!
  • Keys
    • 1.Sd8!
      • 1...Qxe4
        • 2.Sa6#
        • 2.Sd7#
        • 2.Se6#
      • 1...Qxc7
        • 2.Sa6#
        • 2.Se6#
      • 1...Qa4
        • 2.Sa6#
        • 2.Se6#
        • 2.Sb7#
      • 1...Qb5
        • 2.Se6#
      • 1...Qd5
        • 2.Sa6#
      • 1...Qb7
        • 2.Sd7#
        • 2.Se6#
        • 2.Sxb7#
      • 1...Qd7
        • 2.Sa6#
        • 2.Sxd7#
        • 2.Sb7#
      • 1...Qa8
        • 2.Sd7#
        • 2.Se6#
      • 1...Qe8
        • 2.Sa6#
        • 2.Sb7#
      • 1...Qa6
        • 2.Sxa6#
        • 2.Sd7#
      • 1...Qb6
        • 2.Sd7#
      • 1...Qd6
        • 2.Sb7#
      • 1...Qe6
        • 2.Sxe6#
        • 2.Sb7#
      • 1...Qf6
        • 2.Sd7#
        • 2.Sb7#
      • 1...g5
        • 2.Rxc6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATE::R1(F),XQ(b)
  • Tries
    • Try
      • S(I);XQ(b)
      • Vars
        • K(a);P-FLIGHT,P_SPINP(c),XS(I)::P=Q
      • Refutation
        • P(c);
    • Try
      • P(G);P_PINQ(b)
      • Threat
        • DUALS(3)
      • Vars
        • Q(b);OGATEB::QAR2(G),XQ(b)
      • Refutation
        • Q(b);N_SPINQ(b),XQ(G)
    • Try
      • P(G);P_PINQ(b)
      • Threat
        • DUALS(3)
      • Vars
        • Q(b);OGATEB::R(G),XQ(b)
      • Refutation
        • Q(b);N_SPINQ(b),XR(G)
  • Actual
    • S(H);
    • Vars
      • Q(b);N_GUARD::S(H)
      • Q(b);N_GUARD::S(I)
      • P(c);OGATE::R1(F),XQ(b)
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