MESON Chess Problem Database

Problem Display
PID: 256881 (B3Q2B/1r1Np2K/bn4N1/1pPk1p2/nP1pr1R1/1P6/8/8 w - - 0 1)

Dawson, Thomas Rayner

British Chess Magazine, 1933

B3Q2B/1r1Np2K/bn4N1/1pPk1p2/nP1pr1R1/1P6/8/8

#2

10 + 10

3713 Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sxd7
      • 2.Qxd7#
    • 1...e6
      • 2.Se7#
  • Tries
    • 1.Sxe7+?
      • 1...Ke6
        • 2.Sf8#
        • 2.Rg6#
      • 1...Rxe7+!
    • 1.Sxb6+?
      • 1...Ke6
        • 2.Sf8#
        • 2.Qg8#
      • 1...Sxb6!
    • 1.Sf6+?
      • 1...Ke6
        • 2.Qg8#
      • 1...exf6+!
    • 1.Bxb7+?
      • 1...Ke6
        • 2.Sgf8#
        • 2.Sdf8#
        • 2.Qxe7#
      • 1...Bxb7!
    • 1.Qf7+?
      • 1...Re6
        • 2.Sxe7#
      • 1...e6
        • 2.Se7#
      • 1...Kc6!
    • 1.Qg8+?
      • 1...Re6
        • 2.Sxe7#
      • 1...e6
        • 2.Se7#
      • 1...Kc6!
  • Keys
    • 1.Sb8!
      • threat
        • 2.Qc6#
      • 1...e5+
        • 2.Qf7#
      • 1...e6+
        • 2.Se7#
      • 1...Ke6
        • 2.Qg8#
      • 1...Re6
        • 2.Rxd4#
      • 1...Sd7
        • 2.Qxd7#

Anticipated by 151108(1933)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(h);OGATE,XS(F)::QAR2(I),XS(h)
    • P(j);P_PINS(F),SBLOCK,S_CUTR(c)::S(E)
  • Tries
    • Try
      • S(E);CHECK,XP(j)
      • Refutation
        • R(c);CHECK,XS(E)
    • Try
      • S(F);CHECK,XS(h)
      • Refutation
        • S(a);XS(F)
    • Try
      • S(F);CHECK
      • Vars
        • K(e);N_GUARD,N_SPINR(i),P_SPINP(j),S_FLIGHT::QAB(I)
      • Refutation
        • P(j);CHECK,XS(F)
    • Try
      • B(H);CHECK,XR(i)
      • Refutation
        • B(g);XB(H)
    • Try
      • Q(I);CHECK
      • Vars
        • R(c);N_SPINR(i),P_SPINR(c)::S(E),XP(j)
        • P(j);P_SPINP(j)::S(E)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • Q(I);CHECK
      • Vars
        • R(c);N_SPINR(i),P_SPINR(c)::S(E),XP(j)
        • P(j);P_PINS(F),P_SPINP(j)::S(E)
      • Refutation
        • K(e);S_FLIGHT
  • Actual
    • S(F);
    • Threat
      • QAB1(I)
    • Vars
      • P(j);CHECK,N_GUARD,S_CUTR(c)::QAB(I)
      • P(j);CHECK,SBLOCK,S_CUTR(c)::S(E)
      • K(e);N_SPINR(i),P_SPINP(j),S_CUTR(c),S_FLIGHT::QAB(I)
      • R(c);OGATE,SBLOCK::R1(C),XP(b)
      • S(h);N_GUARD::QAR2(I),XS(h)
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