MESON Chess Problem Database

Problem Display
PID: 103644 (r3k3/3p4/pR4K1/8/1B6/3p3B/8/3Q4 w - - 0 1)

Lukyanov, Valentin Volodimirovich

Nahodkinskij rabocij, 1965

r3k3/3p4/pR4K1/8/1B6/3p3B/8/3Q4

#2

5 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra7
      • 2.Rb8#
    • 1...Rb8
      • 2.Rxb8#
    • 1...Rd8
      • 2.Qe1#
  • Tries
    • 1.Qg4?
      • threat
        • 2.Qxd7#
      • 1...Kd8
        • 2.Qxd7#
      • 1...Ra7
        • 2.Rb8#
      • 1...Rd8
        • 2.Qe4#
      • 1...d5
        • 2.Qd7#
      • 1...d6!
  • Keys
    • 1.Qa4!
      • threat
        • 2.Qxd7#
      • 1...Kd8
        • 2.Qxd7#
      • 1...Ra7
        • 2.Rb8#
      • 1...Rd8
        • 2.Re6#

FEATURES

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