MESON Chess Problem Database

Problem Display
PID: 71852 (1q4b1/8/N2n1NQ1/2P2p2/B1k2rRr/1p1Rp2p/4K3/B7 w - - 0 1)

Allison, Christopher John

Chess, 1952

1q4b1/8/N2n1NQ1/2P2p2/B1k2rRr/1p1Rp2p/4K3/B7

#2

9 + 10

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Rd4
      • 2.Rc3#
      • 2.Rdxd4#
    • 1...Se4
      • 2.Rd4#
    • 1...Sb5
      • 2.Bxb3#
    • 1...Sc8
      • 2.Qxg8#
    • 1...Se8
      • 2.Qxg8#
  • Tries
    • 1.Sd5?
      • threat
        • 2.Sxe3#
      • 1...Qe8
        • 2.Sb6#
      • 1...Bxd5!
    • 1.Rxf4+?
      • 1...Se4
        • 2.Rd4#
      • 1...Rxf4!
    • 1.Qxg8+?
      • 1...Sf7
        • 2.Qxf7#
      • 1...Qxg8!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Se5#
      • 1...Rd4
        • 2.Rdxd4#
      • 1...Qe8
        • 2.Sb6#
      • 1...Se4
        • 2.Rd4#
      • 1...Sb5
        • 2.Bxb3#
      • 1...Sb7
        • 2.Sb6#
      • 1...Sf7
        • 2.Qe6#
      • 1...Sc8
        • 2.Qxg8#
      • 1...Se8
        • 2.Qxg8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(h);N_SPINR(e),S_CUTR(e)::R1(C)
    • S(h);SBLOCK,S_CUTQ(i)::B(D),XP(a)
    • S(h);N_GUARD,S_CUTQ(i)::QAB(I),XB(j)
  • Tries
    • Try
      • S(H);
      • Threat
        • S(H),XP(b)
      • Vars
        • Q(i);N_GUARD::S(H)
      • Refutation
        • B(j);XS(H)
    • Try
      • R(E);CHECK,XR(e)
      • Vars
        • S(h);P_SPINS(h)::R1(C)
      • Refutation
        • R(f);XR(E)
    • Try
      • Q(I);CHECK,XB(j)
      • Vars
        • S(h);N_GUARD,P_SPINS(h)::QAB(I),XS(h)
      • Refutation
        • Q(i);XQ(I)
  • Actual
    • S(H);
    • Threat
      • S(H)
    • Vars
      • R(e);N_GUARD::R1(C),XR(e)
      • Q(i);N_GUARD::S(H)
      • S(h);N_SPINR(e),S_CUTR(e)::R1(C)
      • S(h);SBLOCK,S_CUTQ(i)::B(D),XP(a)
      • S(h);S_CUTQ(i)::S(H)
      • S(h);S_CUTB(j)::QAB(I)
      • S(h);N_GUARD,S_CUTQ(i)::QAB(I),XB(j)
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