MESON Chess Problem Database

Problem Display
PID: 103588 (8/8/p7/1pQ5/k2p4/N7/1K6/8 w - - 0 1)

Ivanov, E

Moscow Ty., 2003

8/8/p7/1pQ5/k2p4/N7/1K6/8

#2

3 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...a5
      • 2.Qxb5#
  • Tries
    • 1.Sc2?
      • threat
        • 2.Qa3#
        • 2.Qb4#
      • 1...b4
        • 2.Qxb4#
      • 1...a5
        • 2.Qa3#
      • 1...Ka5!
    • 1.Sc4?
      • threat
        • 2.Qa3#
      • 1...b4
        • 2.Sb6#
        • 2.Qa5#
        • 2.Qc6#
      • 1...bxc4!
  • Keys
    • 1.Sxb5!
      • 1...Ka5
        • 2.Sc3#
      • 1...axb5
        • 2.Qa3#
      • 1...d3
        • 2.Sc3#
      • 1...a5
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(d);N_GUARD::QAB1(C),XP(c)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);::QAR1(C),XP(c)
        • P(d);SBLOCK::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(c)
    • Try
      • S(B);
      • Threat
        • QAR1(C)
      • Refutation
        • P(c);XS(B)
  • Actual
    • S(B);XP(c)
    • Vars
      • K(a);P-FLIGHT::QAR(C)+S(B)
      • P(d);SBLOCK,XS(B)::QAR1(C)
      • P(b);N_GUARD::S(B)
      • P(d);SBLOCK::QAR2(C)
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