MESON Chess Problem Database

Problem Display
PID: 135912 (4b3/4Q3/8/3p4/p7/8/3p1K1p/7k w - - 0 1)

Uppstrom, Rolf

Springaren, 2009

4b3/4Q3/8/3p4/p7/8/3p1K1p/7k

#2

2 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...d1B
      • 2.Qe1#
    • 1...d4
      • 2.Qe4#
  • Tries
    • 1.Qg5?
      • threat
        • 2.Qg2#
        • 2.Qxd5#
      • 1...d1Q
        • 2.Qg2#
      • 1...d1B
        • 2.Qg2#
      • 1...d1R
        • 2.Qg2#
      • 1...Bh5
        • 2.Qg2#
      • 1...Bc6
        • 2.Qg2#
      • 1...Bg6
        • 2.Qg2#
      • 1...Bf7
        • 2.Qg2#
      • 1...d4
        • 2.Qg2#
        • 2.Qd5#
      • 1...d1S+!
  • Keys
    • 1.Qe2!
      • threat
        • 2.Qd1#
        • 2.Qf1#
        • 2.Qf3#
      • 1...d1S+
        • 2.Qxd1#
      • 1...d1Q
        • 2.Qxd1#
      • 1...d1B
        • 2.Qxd1#
        • 2.Qf1#
        • 2.Qe1#
      • 1...d1R
        • 2.Qxd1#
        • 2.Qf3#
      • 1...Bb5
        • 2.Qf3#
      • 1...Bh5
        • 2.Qf1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • P(b);N_GUARD::QAR(B)
    • P(e);N_GUARD::QAB(B)
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::QAB1(B)
        • B(f);::QAB1(B)
      • Refutation
        • P(b);CHECK
  • Actual
    • Q(B);
    • Threat
      • DUALS(3)
    • Vars
      • P(b);CHECK::QAR(B),XS(b)
      • P(b);::QAR(B),XQ(b)
      • B(f);::QAB(B)
      • B(f);::QAR2(B)
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