MESON Chess Problem Database

Problem Display
PID: 125415 (4rk2/4pp1K/8/8/8/8/Q7/4R3 w - - 0 1)

Anonymous

Source?, 0000

4rk2/4pp1K/8/8/8/8/Q7/4R3

#2

3 + 4

3713 Snap 2009
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Qxa8#
    • 1...f5
      • 2.Qg8#
    • 1...f6
      • 2.Qg8#
  • Tries
    • 1.Rf1?
      • threat
        • 2.Rxf7#
        • 2.Qxf7#
      • 1...Ra8
        • 2.Qxf7#
        • 2.Qxa8#
      • 1...Rb8
        • 2.Qxf7#
      • 1...Rc8
        • 2.Qxf7#
      • 1...Rd8
        • 2.Qxf7#
      • 1...f5
        • 2.Rxf5#
        • 2.Qg8#
      • 1...f6
        • 2.Qg8#
      • 1...e6!
  • Keys
    • 1.Qe6!
      • threat
        • 2.Qh6#
      • 1...fxe6
        • 2.Rf1#
      • 1...Ra8
        • 2.Qxe7#
      • 1...Rb8
        • 2.Qxe7#
      • 1...Rc8
        • 2.Qxc8#
        • 2.Qxe7#
      • 1...Rd8
        • 2.Qxe7#
      • 1...f5
        • 2.Qxf5#
        • 2.Qg8#
      • 1...f6
        • 2.Qg8#

This anticipates 22404(1927)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(c);OGATEB::QAR(B),XR(c)
    • P(b);OGATE::QAR1(B)
  • Tries
    • Try
      • R(A);P_PINP(b)
      • Threat
        • DUALS(2)
      • Vars
        • R(c);::QAR1(B),XP(b)
        • P(b);OGATE::QAR1(B)
      • Refutation
        • P(a);
  • Actual
    • Q(B);
    • Threat
      • QAB(B)
    • Vars
      • P(b);OGATEB,XQ(B)::R(A)
      • R(c);N_GUARD::QAB1(B),XP(a)
      • P(b);OGATE::QAR1(B)
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Developed and maintained by Brian Stephenson.
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