MESON Chess Problem Database

Problem Display
PID: 159562 (k7/p7/8/1R6/3pp3/8/7K/3Q4 w - - 0 1)

Rozhkov, L

10th Comm., Kozhakin-50 JT, 2007

k7/p7/8/1R6/3pp3/8/7K/3Q4

#2

3 + 4

145 StrateGems 2012
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...e3
      • 2.Qf3#
      • 2.Qh1#
  • Tries
    • 1.Qb3?
      • threat
        • 2.Rb8#
        • 2.Qd5#
        • 2.Qg8#
      • 1...a5
        • 2.Rxa5#
      • 1...a6!
    • 1.Qa4?
      • 1...a5
        • 2.Qxa5#
      • 1...a6
        • 2.Qxa6#
      • 1...d3
        • 2.Qxe4#
      • 1...e3!
    • 1.Qb1?
      • threat
        • 2.Rb8#
        • 2.Qxe4#
      • 1...a5
        • 2.Rxa5#
      • 1...d3
        • 2.Rb8#
      • 1...e3
        • 2.Rb8#
        • 2.Qe4#
        • 2.Qh1#
      • 1...a6!
    • 1.Qe1?
      • threat
        • 2.Qxe4#
      • 1...a5
        • 2.Qxa5#
      • 1...e3
        • 2.Qh1#
      • 1...a6!
  • Keys
    • 1.Qa1!
      • 1...a5
        • 2.Qxa5#
      • 1...a6
        • 2.Qxa6#
      • 1...d3
        • 2.Qh8#
      • 1...e3
        • 2.Qh1#

Anticipated by 193730(1916)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • P(c);OGATEB::R(C),XP(c)
      • Refutation
        • P(c);
    • Try
      • Q(A);P_PINP(c)
      • Vars
        • P(c);OGATEB::QAR(A),XP(c)
        • P(c);OGATEB::QAR2(A),XP(c)
        • P(a);OGATE::QAB(A),XP(b)
      • Refutation
        • P(b);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);OGATEB::R(C),XP(c)
        • P(a);::R1(C)
      • Refutation
        • P(c);
    • Try
      • Q(A);
      • Threat
        • QAB(A),XP(b)
      • Vars
        • P(c);OGATEB::QAR(A),XP(c)
        • P(b);OGATEB::QAB(A)
      • Refutation
        • P(c);
  • Actual
    • Q(A);P_PINP(c)
    • Vars
      • P(c);OGATEB::QAR(A),XP(c)
      • P(c);OGATEB::QAR2(A),XP(c)
      • P(a);OGATE::QAB1(A)
      • P(b);OGATEB::QAB(A)
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