MESON Chess Problem Database

Problem Display
PID: 118587 (5B2/8/1p5N/1n1Bk3/2rR2pQ/3rpPP1/q3nN1K/1b6 w - - 0 1)

Sheppard, Charles William

American Chess Bulletin, 1950

5B2/8/1p5N/1n1Bk3/2rR2pQ/3rpPP1/q3nN1K/1b6

#2

9 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd4
      • 2.Qg5#
    • 1...Sd6
      • 2.Bg7#
  • Tries
    • 1.Shxg4+?
      • 1...Kf5
        • 2.Qf6#
        • 2.Qh5#
      • 1...Kxd4!
    • 1.Sf7+?
      • 1...Kf5
        • 2.Qg5#
      • 1...Kxd4!
    • 1.Bg8?
      • threat
        • 2.Bg7#
      • 1...Kxd4
        • 2.Qf6#
      • 1...Rdxd4
        • 2.Qe7#
      • 1...Rcxd4
        • 2.Qg5#
      • 1...Sexd4
        • 2.f4#
      • 1...Sbxd4
        • 2.Sfxg4#
      • 1...Rc6
        • 2.Re4#
      • 1...Rc7
        • 2.Re4#
      • 1...Qa7!
    • 1.Qh5+?
      • 1...Kf6
        • 2.Se4#
        • 2.Sfxg4#
        • 2.Shxg4#
        • 2.Sg8#
        • 2.Qf5#
      • 1...Kxd4!
  • Keys
    • 1.Bf7!
      • threat
        • 2.Bg7#
      • 1...Kxd4
        • 2.Qf6#
      • 1...Rdxd4
        • 2.Qe7#
      • 1...Rcxd4
        • 2.Qg5#
      • 1...Sexd4
        • 2.f4#
      • 1...Sbxd4
        • 2.Sfxg4#
      • 1...Rc6
        • 2.Re4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • R(f);SBLOCK,XR(E)::QAR2(F)
    • S(h);SBLOCK::B(I)
  • Tries
    • Try
      • S(H);CHECK,XP(g)
      • Refutation
        • K(i);S_FLIGHT,XR(E)
    • Try
      • S(H);CHECK
      • Vars
        • K(i);P-FLIGHT::QAR1(F)
      • Refutation
        • K(i);P_SPINP(g),S_FLIGHT,XR(E)
    • Try
      • B(G);
      • Threat
        • B(I)
      • Vars
        • K(i);P_SPINP(g),S_FLIGHT,XR(E)::QAB(F)
        • R(d);SBLOCK,XR(E)::QAR2(F)
        • R(f);SBLOCK,XR(E)::QAR2(F)
        • S(c);N_GUARD,P_PINS(A),SBLOCK,XR(E)::P(C)
        • S(h);SBLOCK,XR(E)::S(A),XP(g)
        • R(f);N_GUARD::R1(E)
      • Refutation
        • Q(b);
    • Try
      • Q(F);CHECK
      • Refutation
        • K(i);S_FLIGHT,XR(E)
  • Actual
    • B(G);
    • Threat
      • B(I)
    • Vars
      • K(i);P_SPINP(g),S_FLIGHT,XR(E)::QAB(F)
      • R(d);SBLOCK,XR(E)::QAR2(F)
      • R(f);SBLOCK,XR(E)::QAR2(F)
      • S(c);N_GUARD,P_PINS(A),SBLOCK,XR(E)::P(C)
      • S(h);SBLOCK,XR(E)::S(A),XP(g)
      • R(f);N_GUARD::R1(E)
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