MESON Chess Problem Database

Problem Display
PID: 10832 (7R/8/8/8/3p4/8/r1p5/k1K4Q w - - 0 1)

Marandiuk, Mikhail Nazarovich

64 Shakhmatnoe obozrenie, 1969

7R/8/8/8/3p4/8/r1p5/k1K4Q

#2

3 + 4

3296 Shakhmatny zadachi miniaturi 1987
5454 Near Snap 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Rxa8#
      • 2.Qxa8#
  • Tries
    • 1.Qb7?
      • 1...Rb2
        • 2.Qxb2#
      • 1...Ra3
        • 2.Qb2#
      • 1...Ra4
        • 2.Qb2#
      • 1...Ra5
        • 2.Qb2#
      • 1...Ra6
        • 2.Qxa6#
        • 2.Qb2#
      • 1...Ra7
        • 2.Qb2#
        • 2.Qxa7#
      • 1...Ra8
        • 2.Rxa8#
        • 2.Qxa8#
        • 2.Qb2#
      • 1...d3!
    • 1.Qa8?
      • 1...Rxa8
        • 2.Rxa8#
      • 1...Ra3
        • 2.Qxa3#
      • 1...Ra4
        • 2.Qxa4#
      • 1...Ra5
        • 2.Qxa5#
      • 1...Ra6
        • 2.Qxa6#
      • 1...Ra7
        • 2.Qxa7#
      • 1...d3!
  • Keys
    • 1.Ra8!
      • 1...Rxa8
        • 2.Qxa8#
      • 1...Ra3
        • 2.Rxa3#
      • 1...Ra4
        • 2.Rxa4#
      • 1...Ra5
        • 2.Rxa5#
      • 1...Ra6
        • 2.Rxa6#
      • 1...Ra7
        • 2.Rxa7#
      • 1...d3
        • 2.Qh8#

This anticipates 262772(1977), 110134(1991)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(B);
      • Vars
        • R(b);N_GUARD::QAB1(B),XR(b)
        • R(b);N_GUARD::QAB1(B)
      • Refutation
        • P(d);
    • Try
      • Q(B);P_PINR(b)
      • Vars
        • R(b);N_SPINR(b),OGATE,XQ(B)::R(C),XR(b)
        • R(b);OGATEB::QAR2(B),XR(b)
        • R(b);OGATEB::QAR(B),XR(b)
      • Refutation
        • P(d);
  • Actual
    • R(C);P_PINR(b)
    • Vars
      • R(b);N_SPINR(b),OGATE,XR(C)::QAB(B),XR(b)
      • R(b);OGATEB::R(C),XR(b)
      • P(d);OGATEB::QAB(B)
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