MESON Chess Problem Database

Problem Display
PID: 173211 (8/1Qp4r/2n3p1/2k5/7r/5N2/1N6/1K1RB3 w - - 0 1)

Shanahan, Ian

Problem Observer, 1994

8/1Qp4r/2n3p1/2k5/7r/5N2/1N6/1K1RB3

#2

6 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sd4
      • 2.Bb4#
    • 1...Sa5
      • 2.Rd5#
    • 1...Se5
      • 2.Rd5#
    • 1...Sa7
      • 2.Rd5#
    • 1...Sb8
      • 2.Rd5#
    • 1...Sd8
      • 2.Rd5#
  • Tries
    • 1.Rd4?
      • threat
        • 2.Sd3#
        • 2.Sa4#
      • 1...Sxd4
        • 2.Bb4#
      • 1...Sb4
        • 2.Sa4#
        • 2.Bxb4#
      • 1...Se5
        • 2.Sa4#
        • 2.Bb4#
        • 2.Rd5#
      • 1...Rxd4!
    • 1.Qa7+?
      • 1...Kb5
        • 2.Rd5#
      • 1...Sxa7!
  • Keys
    • 1.Se5!
      • threat
        • 2.Qxc6#
      • 1...Sxe5
        • 2.Rd5#
      • 1...Sd4
        • 2.Bb4#
      • 1...Sb4
        • 2.Sa4#
      • 1...Sa5
        • 2.Rd5#
      • 1...Sa7
        • 2.Rd5#
      • 1...Se7
        • 2.Sd7#
      • 1...Sb8
        • 2.Rd5#
      • 1...Sd8
        • 2.Rd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD,S_CUTR(a)::B(C)
    • S(c);::R1(B)
  • Tries
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);N_GUARD,XR(B)::B(C)
      • Refutation
        • R(a);XR(B)
    • Try
      • Q(F);CHECK
      • Vars
        • K(b);P-FLIGHT::R(B)
      • Refutation
        • S(c);XQ(F)
  • Actual
    • S(E);
    • Threat
      • QAR1(F),XS(c)
    • Vars
      • S(c);XS(E)::R1(B)
      • S(c);N_GUARD,S_CUTR(a)::B(C)
      • S(c);S_CUTR(a)::S(D)
      • S(c);::R1(B)
      • S(c);S_CUTR(f)::S(E)
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Developed and maintained by Brian Stephenson.
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