MESON Chess Problem Database

Problem Display
PID: 108995 (r3k3/3p1R2/1R1p2K1/p7/8/1P6/Q7/8 w - - 0 1)

Monteiro da Silveira, Jose Luis

Sonnenfeld JT, 1960

r3k3/3p1R2/1R1p2K1/p7/8/1P6/Q7/8

#2

5 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra6
      • 2.Rb8#
    • 1...Ra7
      • 2.Rb8#
    • 1...Rb8
      • 2.Rxb8#
    • 1...Rd8
      • 2.Qe2#
  • Tries
    • 1.Qxa5?
      • threat
        • 2.Qxa8#
      • 1...Kd8
        • 2.Rb8#
      • 1...Rxa5
        • 2.Rb8#
      • 1...Ra6
        • 2.Rb8#
      • 1...Ra7
        • 2.Rb8#
      • 1...Rb8
        • 2.Rxb8#
      • 1...Rd8
        • 2.Qe1#
      • 1...Rc8!
  • Keys
    • 1.Qa4!
      • threat
        • 2.Qxd7#
      • 1...Kd8
        • 2.Qxd7#
      • 1...Ra7
        • 2.Rb8#
      • 1...Rd8
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(d);N_GUARD::R(C)
    • R(d);N_GUARD::R(C),XR(d)
    • R(d);SBLOCK::QAR(A)
  • Tries
    • Try
      • Q(A);XP(a)
      • Threat
        • QAR(A),XR(d)
      • Vars
        • K(e);P-FLIGHT::QAB(A)+R(C),DCHECK
        • R(d);N_GUARD,XQ(A)::R(C)
        • R(d);N_GUARD::R(C)
        • R(d);N_GUARD::R(C),XR(d)
        • R(d);SBLOCK::QAB(A)
      • Refutation
        • R(d);
  • 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(C)
      • R(d);SBLOCK::QAR(A)
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