MESON Chess Problem Database

Problem Display
PID: 186630 (kr2R3/rp1n4/2p1N3/1n6/R1N1Q3/5B2/6K1/8 w - - 0 1)

Harrison, G

Chess, 1959

kr2R3/rp1n4/2p1N3/1n6/R1N1Q3/5B2/6K1/8

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sa3
      • 2.Sc7#
    • 1...Sc3
      • 2.Sc7#
    • 1...Sd4
      • 2.Sc7#
    • 1...Sd6
      • 2.Sc7#
    • 1...Sc7
      • 2.Sxc7#
    • 1...Sc5
      • 2.Sb6#
    • 1...Se5
      • 2.Sb6#
    • 1...Sb6
      • 2.Sxb6#
    • 1...Sf6
      • 2.Sb6#
    • 1...Sf8
      • 2.Sb6#
    • 1...c5
      • 2.Qxb7#
    • 1...b6
      • 2.Qxc6#
  • Tries
    • 1.Rxa7+?
      • 1...Sxa7
        • 2.Sc7#
      • 1...Kxa7!
    • 1.Rxb8+?
      • 1...Sxb8
        • 2.Sb6#
      • 1...Kxb8!
  • Keys
    • 1.Qxc6!
      • threat
        • 2.Qxb7#
      • 1...bxc6
        • 2.Bxc6#
      • 1...Sd6
        • 2.Sc7#
      • 1...Sc5
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 10
  • Sets
    • S(a);N_GUARD::S(F)
    • S(a);N_GUARD::S(F),XS(a)
    • S(e);N_GUARD::S(D)
    • S(e);N_GUARD::S(D),XS(e)
    • P(b);OGATE,P_SPINP(d)::QAB1(E),XP(d)
    • P(d);OGATEB,P_SPINP(b)::QAB(E),XP(b)
  • Tries
    • Try
      • R(C);CHECK,P_PINR(g),XR(c)
      • Vars
        • S(a);SBLOCK,XR(C)::S(F)
      • Refutation
        • K(f);N_SPINR(g),P-FLIGHT,XR(C)
    • Try
      • R(G);CHECK,XR(g)
      • Vars
        • S(e);SBLOCK,XR(G)::S(D)
      • Refutation
        • K(f);N_SPINR(c),P-FLIGHT,XR(G)
  • Actual
    • Q(E);P_PINP(d),XP(b)
    • Threat
      • QAB1(E),XP(d)
    • Vars
      • P(d);OGATE,XQ(E)::B(B),XP(d)
      • S(a);N_GUARD::S(F)
      • S(e);N_GUARD::S(D)
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