MESON Chess Problem Database

Problem Display
PID: 137247 (3r4/4N2B/4RP2/4p2K/R1nr1kP1/2Q2pp1/3p4/4N1bb w - - 0 1)

Ellerman, Arnoldo

Australasian Chess Magazine, 1920

3r4/4N2B/4RP2/4p2K/R1nr1kP1/2Q2pp1/3p4/4N1bb

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rd3
      • 2.Qxe5#
    • 1...Re4
      • 2.Sg6#
    • 1...R4d6
      • 2.Qxe5#
    • 1...R4d7
      • 2.Qxe5#
    • 1...Se3
      • 2.Sd3#
    • 1...Sd6
      • 2.Sd5#
    • 1...g2
      • 2.Qxf3#
    • 1...e4
      • 2.Sg6#
  • Tries
    • 1.Sd3+?
      • 1...Rxd3
        • 2.Qxe5#
      • 1...Ke3!
  • Keys
    • 1.f7!
      • threat
        • 2.Rf6#
      • 1...Rd3
        • 2.Qxe5#
      • 1...g2
        • 2.Qxf3#
      • 1...R4d6
        • 2.Qxe5#
      • 1...R8d6
        • 2.f8Q#
        • 2.f8R#
      • 1...Se3
        • 2.Sd3#
      • 1...Sd6
        • 2.Sd5#
      • 1...e4
        • 2.Sg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • R(g);OGATE,P_SPINS(f)::QAB1(B),XP(i)
    • R(g);SBLOCK::S(H)
    • S(f);P_SPINR(g),SBLOCK::S(A)
    • S(f);P_SPINR(g),S_CUTR(j)::S(H)
    • P(e);S_CUTB(b)::QAR1(B),XP(d)
    • P(i);::S(H)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • R(g);OGATE,P_SPINS(f),XS(A)::QAB1(B),XP(i)
      • Refutation
        • K(h);P_SPINP(i),S_FLIGHT
  • Actual
    • P(G);
    • Threat
      • R(F)
    • Vars
      • R(g);OGATE,P_SPINS(f)::QAB1(B),XP(i)
      • P(e);S_CUTB(b)::QAR1(B),XP(d)
      • R(j);N_GUARD::P=Q
      • S(f);P_SPINR(g),SBLOCK::S(A)
      • S(f);P_SPINR(g),S_CUTR(j)::S(H)
      • P(i);::S(H)
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