MESON Chess Problem Database

Problem Display
PID: 71761 (1K1B4/1R6/p1p3Nk/1b3P2/q4pP1/1r2Q3/3n2P1/4r1R1 w - - 0 1)

Ellerman, Arnoldo

Le Monde des Echecs, 1946

1K1B4/1R6/p1p3Nk/1b3P2/q4pP1/1r2Q3/3n2P1/4r1R1

#2

9 + 9

81 Chess 1952

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Qxf4#
    • 1...Qa2
      • 2.Qxf4#
    • 1...Qa3
      • 2.Qxf4#
    • 1...Qa5
      • 2.Qxf4#
    • 1...Re2
      • 2.Rh1#
    • 1...Rb1
      • 2.Qh3#
    • 1...Rb2
      • 2.Qh3#
    • 1...Rb4
      • 2.Qh3#
    • 1...Bf1
      • 2.Rh1#
    • 1...Bd3
      • 2.Qh3#
    • 1...Bc4
      • 2.Qxf4#
    • 1...Sc4
      • 2.Qxf4#
  • Tries
    • 1.Qe7?
      • threat
        • 2.Qh4#
        • 2.Qg5#
        • 2.Qf8#
        • 2.Qg7#
        • 2.Qh7#
      • 1...Qa1
        • 2.Qh4#
        • 2.Qg5#
        • 2.Qh7#
      • 1...Qa3
        • 2.Qh4#
        • 2.Qg5#
        • 2.Qg7#
        • 2.Qh7#
      • 1...Qb4
        • 2.Qh4#
        • 2.Qg5#
        • 2.Qg7#
        • 2.Qh7#
      • 1...Qd4
        • 2.Qh4#
        • 2.Qg5#
        • 2.Qh7#
      • 1...Rh3
        • 2.Qg5#
        • 2.Qf8#
        • 2.Qg7#
        • 2.Qh7#
      • 1...Sf3
        • 2.Qf8#
        • 2.Qg7#
        • 2.Qh7#
      • 1...Se4
        • 2.Qh4#
        • 2.Qf8#
        • 2.Qg7#
        • 2.Qh7#
      • 1...Rxe7!
  • Keys
    • 1.Sf8!
      • threat
        • 2.Rh7#
      • 1...Bf1
        • 2.Rh1#
      • 1...Be2
        • 2.Qe6#
      • 1...Bd3
        • 2.Qh3#
      • 1...Bc4
        • 2.Qxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • Q(d);N_GUARD::QAB(C),XP(e)
    • R(a);N_GUARD::R(A)
    • R(c);N_GUARD::QAR(C)
    • B(f);P_PINR(G),S_CUTR(a)::R(A)
    • B(f);P_PINR(G),S_CUTR(c)::QAR(C)
    • B(f);P_PINR(G),S_CUTQ(d)::QAB(C),XP(e)
    • S(b);S_CUTQ(d)::QAB(C),XP(e)
  • Tries
    • Try
      • Q(C);N_PINP(e)
      • Threat
        • DUALS(5)
      • Refutation
        • R(a);XQ(C)
  • Actual
    • S(F);
    • Threat
      • R1(G)
    • Vars
      • B(f);P_PINR(G),S_CUTR(a)::R(A)
      • B(f);P_PINR(G),S_CUTR(a)::QAR(C)
      • B(f);P_PINR(G),S_CUTR(c)::QAR(C)
      • B(f);P_PINR(G),S_CUTQ(d)::QAB(C),XP(e)
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