MESON Chess Problem Database

Problem Display
PID: 87649 (8/5K2/5nQp/7n/8/7k/6R1/8 w - - 0 1)

McDowell, Michael

The Problemist, 1993

8/5K2/5nQp/7n/8/7k/6R1/8

#2

3 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kh4
      • 2.Rh2#
    • 1...Sg3
      • 2.Qxg3#
    • 1...Sf4
      • 2.Qg3#
    • 1...Sg7
      • 2.Qg3#
    • 1...Se4
      • 2.Qg4#
    • 1...Sg4
      • 2.Qxg4#
    • 1...Sd5
      • 2.Qg4#
    • 1...Sd7
      • 2.Qg4#
    • 1...Sh7
      • 2.Qg4#
    • 1...Se8
      • 2.Qg4#
    • 1...Sg8
      • 2.Qg4#
  • Tries
    • 1.Qg5?
      • 1...Sg3
        • 2.Qxg3#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sf4
        • 2.Qg3#
      • 1...Sg7
        • 2.Qg3#
      • 1...Se4
        • 2.Qg4#
      • 1...Sd5
        • 2.Qg4#
      • 1...Sd7
        • 2.Qg4#
      • 1...Sh7
        • 2.Qg4#
      • 1...Se8
        • 2.Qg4#
      • 1...Sg8
        • 2.Qg4#
      • 1...hxg5!
    • 1.Qg7?
      • 1...Kh4
        • 2.Rh2#
      • 1...Sg3
        • 2.Qxg3#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sf4
        • 2.Qg3#
      • 1...Se4
        • 2.Qg4#
      • 1...Sd5
        • 2.Qg4#
      • 1...Sd7
        • 2.Qg4#
      • 1...Sh7
        • 2.Qg4#
      • 1...Se8
        • 2.Qg4#
      • 1...Sg8
        • 2.Qg4#
      • 1...Sxg7!
  • Keys
    • 1.Rg1!
      • threat
        • 2.Rh1#
      • 1...Kh2
        • 2.Qg2#
      • 1...Kh4
        • 2.Rh1#
      • 1...Sg3
        • 2.Qxg3#
      • 1...Sg4
        • 2.Qxh5#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • K(a);P-FLIGHT::R(A)
    • S(b);N_GUARD::QAR1(B),XS(b)
    • S(b);N_GUARD::QAR1(B)
    • S(c);N_GUARD::QAB1(B)
    • S(c);N_GUARD::QAB1(B),XS(c)
  • Tries
    • Try
      • Q(B);
      • Vars
        • S(b);N_GUARD::QAR1(B),XS(b)
        • S(c);N_GUARD::QAB1(B),XS(c)
        • S(b);N_GUARD::QAR1(B)
        • S(c);N_GUARD::QAB1(B)
      • Refutation
        • P(d);XQ(B)
    • Try
      • Q(B);
      • Vars
        • K(a);P-FLIGHT::R(A)
        • S(b);N_GUARD::QAR1(B),XS(b)
        • S(c);N_GUARD::QAB1(B),XS(c)
        • S(b);N_GUARD::QAR1(B)
        • S(c);N_GUARD::QAB1(B)
      • Refutation
        • S(b);XQ(B)
  • Actual
    • R(A);
    • Threat
      • R(A)
    • Vars
      • K(a);P-FLIGHT::QAR1(B)
      • K(a);P-FLIGHT::R(A)
      • S(b);N_GUARD::QAR1(B),XS(b)
      • S(c);N_GUARD::QAR2(B),XS(b)
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