MESON Chess Problem Database

Problem Display
PID: 93859 (5N2/6n1/7p/6kN/7p/7p/4QP1K/8 w - - 0 1)

Pesta, Roman

Sachove umeni (Ceskoslovensky sach), 1952

5N2/6n1/7p/6kN/7p/7p/4QP1K/8

#2

5 + 5

6490 yacpdb 2009
5454 Near Snap 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Sf5
      • 2.f4#
  • Tries
    • 1.Kxh3?
      • threat
        • 2.Qg4#
      • 1...Sxh5
        • 2.Qe5#
      • 1...Kf5!
    • 1.Qe4?
      • threat
        • 2.Qg6#
      • 1...Kxh5
        • 2.Qg6#
      • 1...Sxh5
        • 2.Sh7#
      • 1...Sf5!
  • Keys
    • 1.f3!
      • 1...Kf5
        • 2.Qb5#
      • 1...Kxh5
        • 2.f4#
      • 1...Sxh5
        • 2.Qe5#
      • 1...Sf5
        • 2.f4#
      • 1...Se6
        • 2.Qe5#
      • 1...Se8
        • 2.Qb5#
        • 2.Qe5#

Anticipated by 107063(1886), 193607(1915)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(e);SBLOCK::P(B)
  • Tries
    • Try
      • K(C);P-FLIGHT,XP(a)
      • Threat
        • QAR1(A)
      • Vars
        • S(e);N_GUARD,SBLOCK,XS(D)::QAR2(A)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(c);P-FLIGHT,XS(D)::QAB1(A)
        • S(e);SBLOCK,XS(D)::S(E)
      • Refutation
        • S(e);
  • Actual
    • P(B);
    • Vars
      • K(c);P-FLIGHT::QAR(A)
      • K(c);P-FLIGHT,XS(D)::QAB(A)+P(B)
      • S(e);N_GUARD,SBLOCK,XS(D)::QAR2(A)
      • S(e);SBLOCK::P(B)
      • S(e);N_GUARD::QAR2(A)
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