MESON Chess Problem Database

Problem Display
PID: 138170 (k7/1pK5/3p4/8/3Q4/r1p5/8/8 w - - 0 1)

Nesic, Milivoj S

Politika Express, 1965

k7/1pK5/3p4/8/3Q4/r1p5/8/8

#2

2 + 5

6490 yacpdb 2011
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rb3
      • 2.Qa4#
    • 1...Ra4
      • 2.Qxa4#
    • 1...Ra7
      • 2.Qh8#
  • Tries
    • 1.Qb6?
      • threat
        • 2.Qxb7#
      • 1...Rb3
        • 2.Qa5#
      • 1...Ra7!
    • 1.Qb4?
      • threat
        • 2.Qxa3#
        • 2.Qxb7#
      • 1...Ka7
        • 2.Qxa3#
        • 2.Qxb7#
      • 1...Ra1
        • 2.Qxb7#
      • 1...Ra2
        • 2.Qxb7#
      • 1...Rb3
        • 2.Qa5#
        • 2.Qa4#
      • 1...Ra4
        • 2.Qxa4#
        • 2.Qxb7#
      • 1...Ra5
        • 2.Qxa5#
        • 2.Qxb7#
      • 1...Ra6
        • 2.Qxb7#
      • 1...b5
        • 2.Qxa3#
      • 1...b6
        • 2.Qxa3#
      • 1...Ra7!
    • 1.Qe4?
      • threat
        • 2.Qxb7#
      • 1...Ka7
        • 2.Qxb7#
      • 1...Rb3
        • 2.Qa4#
      • 1...Ra7
        • 2.Qe8#
      • 1...d5!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qxb7#
      • 1...Ka7
        • 2.Qxb7#
      • 1...Rb3
        • 2.Qa5#
      • 1...Ra7
        • 2.Qg8#

This anticipates 229327(1972), 184335(1979-1980)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(a);N_GUARD::QAR(A)
    • R(a);N_GUARD::QAR(A),XR(a)
    • R(a);SBLOCK::QAB1(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A),XP(d)
      • Vars
        • R(a);N_GUARD::QAR(A)
      • Refutation
        • R(a);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);::QAB1(A),XP(d)
        • P(d);::QAR(A),XR(a)
      • Refutation
        • R(a);
    • Try
      • Q(A);P_PINP(d)
      • Threat
        • QAB1(A),XP(d)
      • Vars
        • K(e);N_SPINP(d),P-FLIGHT::QAR1(A),XP(d)
        • R(a);N_GUARD::QAR(A)
        • R(a);SBLOCK::QAR(A)
      • Refutation
        • P(c);N_SPINP(d)
  • Actual
    • Q(A);P_PINP(d)
    • Threat
      • QAB1(A),XP(d)
    • Vars
      • K(e);N_SPINP(d),P-FLIGHT::QAR1(A),XP(d)
      • R(a);N_GUARD::QAR(A)
      • R(a);SBLOCK::QAR(A)
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