MESON Chess Problem Database

Problem Display
PID: 21744 (3Q4/4p3/Rn1nk1K1/8/3P4/2N5/8/8 w - - 0 1)

Promislo, Charles

3rd HM., 8. American Chess Congress, 1921

3Q4/4p3/Rn1nk1K1/8/3P4/2N5/8/8

#2

5 + 4

3132 The Good Companion Two-Mover 1922
3360 Simple Two-move Themes 1924
887 Mate in Two Moves 1931
5501 Chess Cameos 1936
5064 100 Years of the American Two-move Chess Problem 1962
3147 Chess Problems: Introduction to an Art 1963
5063 Spectacular Chess Problems 1965
15 British Chess Magazine 1993
3310 2345 Chess Problems 1997
133 The Problemist Supplement 2006
81 Chess 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Sa4
      • 2.Qc8#
    • 1...Sbc4
      • 2.Qc8#
    • 1...Sd5
      • 2.Qc8#
    • 1...Sd7
      • 2.Qg8#
    • 1...Sa8
      • 2.Qc8#
    • 1...Sbc8
      • 2.Qxc8#
    • 1...Sdc4
      • 2.Qd5#
    • 1...Se4
      • 2.Qd5#
    • 1...Sb5
      • 2.Qd5#
    • 1...Sf5
      • 2.Qd5#
    • 1...Sb7
      • 2.Qd5#
    • 1...Sf7
      • 2.Qd5#
    • 1...Sdc8
      • 2.Qd5#
    • 1...Se8
      • 2.Qd5#
  • Tries
    • 1.Se2?
      • threat
        • 2.Sf4#
      • 1...Sd5
        • 2.Qc8#
      • 1...Kd5!
    • 1.Sd5?
      • threat
        • 2.Sf4#
        • 2.Sc7#
      • 1...Sxd5
        • 2.Qc8#
      • 1...Sa8
        • 2.Sf4#
      • 1...Sb5
        • 2.Sf4#
      • 1...Se8
        • 2.Sf4#
      • 1...Kxd5!
  • Keys
    • 1.Qc7!
      • 1...Sa4
        • 2.Qc8#
      • 1...Sbc4
        • 2.Qc8#
      • 1...Sd5
        • 2.Qc8#
      • 1...Sd7
        • 2.Qc4#
      • 1...Sa8
        • 2.Qc8#
      • 1...Sbc8
        • 2.Qxc8#
      • 1...Sdc4
        • 2.d5#
      • 1...Se4
        • 2.d5#
      • 1...Sb5
        • 2.d5#
      • 1...Sf5
        • 2.d5#
      • 1...Sb7
        • 2.d5#
      • 1...Sf7
        • 2.d5#
      • 1...Sdc8
        • 2.d5#
      • 1...Se8
        • 2.d5#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 9
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD,P_SPINS(b)::QAB(E)
    • S(a);P_SPINS(b),SBLOCK::QAB(E)
    • S(a);N_GUARD,P_SPINS(b)::QAB(E),XS(a)
    • S(b);OGATE,P_SPINS(a)::QAB1(E)
  • Tries
    • Try
      • S(A);
      • Threat
        • S(A)
      • Vars
        • S(a);N_GUARD,P_SPINS(b),SBLOCK::QAB(E)
      • Refutation
        • K(c);P_SPINS(b),S_FLIGHT
    • Try
      • S(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);N_GUARD,P_SPINS(b),SBLOCK,XS(A)::QAB(E)
        • S(a);P_SPINS(b)::S(A)
        • S(b);P_SPINS(a)::S(A)
      • Refutation
        • K(c);P_SPINS(b),S_FLIGHT,XS(A)
  • Actual
    • Q(E);
    • Vars
      • S(a);N_GUARD,P_SPINS(b)::QAB(E)
      • S(a);N_GUARD,P_SPINS(b),SBLOCK::QAB(E)
      • S(a);N_GUARD,P_SPINS(b)::QAB(E),XS(a)
      • S(b);P_SPINS(a)::P(B)
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