MESON Chess Problem Database

Problem Display
PID: 153204 (r1QB4/2p5/p7/8/k1K5/8/8/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2011

r1QB4/2p5/p7/8/k1K5/8/8/8

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Rb8
      • 2.Qxa6#
  • Tries
    • 1.Qb8?
      • threat
        • 2.Qb4#
      • 1...Ka3
        • 2.Qb3#
      • 1...Ka5
        • 2.Qb4#
      • 1...a5
        • 2.Qb3#
      • 1...c5
        • 2.Qb3#
      • 1...Rxb8!
  • Keys
    • 1.Qb7!
      • threat
        • 2.Qb4#
      • 1...Ka3
        • 2.Qb3#
      • 1...Ka5
        • 2.Qb4#
      • 1...Rb8
        • 2.Qxa6#
      • 1...a5
        • 2.Qb3#
      • 1...c5
        • 2.Qb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(d);N_GUARD::QAR2(B),XP(b)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
        • K(a);P-FLIGHT,P_SPINP(c)::QAB1(B)
        • P(b);SBLOCK::QAB1(B)
        • P(c);::QAB1(B)
      • Refutation
        • R(d);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • K(a);P-FLIGHT::QAR1(B)
      • K(a);P-FLIGHT,P_SPINP(c)::QAB1(B)
      • R(d);N_GUARD::QAR2(B),XP(b)
      • P(b);SBLOCK::QAB1(B)
      • P(c);::QAB1(B)
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