MESON Chess Problem Database

Problem Display
PID: 137769 (2KQ1B2/5N2/8/4P3/P1kPN2R/1prnp3/2b4p/3R4 w - - 0 1)

Ellerman, Arnoldo

4th HM., Arbejder-Skak, 1936

2KQ1B2/5N2/8/4P3/P1kPN2R/1prnp3/2b4p/3R4

#2

10 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sxe5
      • 2.Sxe5#
    • 1...e2
      • 2.Sd2#
  • Tries
    • 1.Qa5?
      • threat
        • 2.Sed6#
      • 1...Kxd4+
        • 2.Sxc3#
      • 1...Sc5
        • 2.Qxc5#
      • 1...b2!
    • 1.Qc7+?
      • 1...Kxd4
        • 2.Sxc3#
        • 2.Sf6#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Kd5!
  • Keys
    • 1.d5!
      • threat
        • 2.Sd2#
      • 1...Kd4+
        • 2.Sc5#
      • 1...Sxe5
        • 2.Sxe5#
      • 1...Sc1
        • 2.Qc7#
      • 1...Se1
        • 2.Qc7#
      • 1...Sb2
        • 2.Qc7#
      • 1...Sf2
        • 2.Qc7#
      • 1...Sb4
        • 2.Sfd6#
      • 1...Sf4
        • 2.Qc7#
      • 1...Sc5
        • 2.Sed6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • S(e);XP(F)::S(G),XS(e)
    • P(f);N_GUARD::S(D)
  • Tries
    • Try
      • Q(I);
      • Threat
        • S(D)
      • Vars
        • K(g);CHECK,P-FLIGHT,P_SPINS(e),XP(C)::R(E)+S(D),XR(d)
        • S(e);N_GUARD::QAR1(I),XS(e)
      • Refutation
        • P(c);
    • Try
      • Q(I);CHECK
      • Vars
        • S(e);N_GUARD,P_SPINS(e)::QAR1(I),XS(e)
      • Refutation
        • K(g);P_PINQ(I),S_FLIGHT
  • Actual
    • P(C);
    • Threat
      • R(E)+S(D),DCHECK
    • Vars
      • K(g);CHECK,P-FLIGHT,P_SPINS(e)::R(E)+S(D)
      • S(e);XP(F)::S(G),XS(e)
      • S(e);N_GUARD::QAR(I)
      • S(e);SBLOCK::S(G)
      • S(e);SBLOCK::R(E)+S(D),DCHECK
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