MESON Chess Problem Database

Problem Display
PID: 180690 (8/p1Q1p2r/1p5p/3k1P1K/2N1pP2/4P3/2r1BN2/8 w - - 0 1)

Shire, David J

Problem Observer, 2012

8/p1Q1p2r/1p5p/3k1P1K/2N1pP2/4P3/2r1BN2/8

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc4
      • 2.Bxc4#
    • 1...a5
      • 2.Sxb6#
    • 1...a6
      • 2.Sxb6#
    • 1...e5
      • 2.Qd6#
    • 1...e6
      • 2.Qd6#
  • Tries
    • 1.Sd3?
      • threat
        • 2.Sb4#
      • 1...Rxc4
        • 2.Qd7#
      • 1...exd3
        • 2.Bf3#
      • 1...a5
        • 2.Sxb6#
      • 1...Rb2!
  • Keys
    • 1.Sxe4!
      • threat
        • 2.Qb7#
      • 1...Kxe4
        • 2.Qe5#
      • 1...Rxe2
        • 2.Sc3#
      • 1...Rxc4
        • 2.Qxc4#
      • 1...e5
        • 2.Sf6#
      • 1...e6
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(a);OGATE,XS(D)::B(A),XR(a)
    • P(f);N_GUARD::S(D),XP(d)
    • P(g);N_GUARD::QAR1(H)
  • Tries
    • Try
      • S(B);
      • Threat
        • S(B)
      • Vars
        • R(a);SBLOCK,XS(D)::QAR2(H)
        • P(b);OGATEB,XS(B)::B(A)
        • P(f);N_GUARD::S(D),XP(d)
      • Refutation
        • R(a);
  • Actual
    • S(B);XP(b)
    • Threat
      • QAB(H)
    • Vars
      • K(c);S_FLIGHT,XS(B)::QAR1(H)
      • R(a);N_GUARD,XB(A)::S(B)
      • R(a);OGATE,XS(D)::QAB1(H),XR(a)
      • P(g);N_GUARD::S(B)
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