MESON Chess Problem Database

Problem Display
PID: 202603 (3R3K/5RP1/1p1P1Nrp/1r2kP2/Qp2n3/3P2PB/2N1p2B/b2bq1n1 w - - 0 1)

Clark, Cecil Henry Douglas

British Chess Magazine, 1923

3R3K/5RP1/1p1P1Nrp/1r2kP2/Qp2n3/3P2PB/2N1p2B/b2bq1n1

#2

13 + 12

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ra5
      • 2.Qe8#
    • 1...Rc5
      • 2.Qe8#
    • 1...Rd5
      • 2.Qe8#
    • 1...Sd2
      • 2.Qxb5#
      • 2.Qxa1#
    • 1...Sf2
      • 2.Qxb5#
      • 2.g4#
    • 1...Sc3
      • 2.d4#
    • 1...Sg5
      • 2.Qxb5#
    • 1...b3
      • 2.Qxe4#
  • Tries
    • 1.Qxa1+?
      • 1...Sc3
        • 2.d4#
      • 1...Qc3!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Qxe4#
      • 1...Sxg3
        • 2.Qe4#
      • 1...Sxd6
        • 2.Sd7#
      • 1...Sxf6
        • 2.Re7#
      • 1...Rg4
        • 2.Sxg4#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Sd2
        • 2.Qxa1#
      • 1...Sf2
        • 2.g4#
      • 1...Sc3
        • 2.d4#
      • 1...Sc5
        • 2.Qd5#
      • 1...Sg5
        • 2.Sg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 7
    • REMOVED MATES = 3
  • Sets
    • R(h);OGATE::QAR(F)
    • S(g);S_CUTB(a)::P(C)
    • S(g);N_GUARD::QAR(F),XR(h)
    • P(f);OGATE::QAR1(F),XS(g)
  • Tries
    • Try
      • Q(F);CHECK,XB(a)
      • Vars
        • S(g);P_SPINS(g)::P(C)
      • Refutation
        • Q(c);P_SPINQ(c)
  • Actual
    • Q(F);
    • Threat
      • QAR1(F),XS(g)
    • Vars
      • S(g);P_SPINS(g),XP(D)::QAR1(F)
      • S(g);SBLOCK,XP(H)::S(I)
      • S(g);SBLOCK,XS(I)::R(J)
      • R(k);N_GUARD::S(I),XR(k)
      • R(h);N_GUARD::QAR1(F),XR(h)
      • S(g);N_GUARD,S_CUTQ(c)::QAB(F),XB(a)
      • S(g);N_GUARD,S_CUTQ(c)::B(B)+P(D)
      • S(g);S_CUTB(a)::P(C)
      • S(g);S_CUTR(h)::QAR1(F)
      • S(g);S_CUTR(k)::S(I)
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