MESON Chess Problem Database

Problem Display
PID: 121001 (8/3NK3/8/3k1p2/Q7/4P3/8/8 w - - 0 1)

Anonymous

Source?, 0000

8/3NK3/8/3k1p2/Q7/4P3/8/8

#2

4 + 2

3713 Snap 2009
6490 yacpdb 2009
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...f4
      • 2.e4#
  • Tries
    • 1.Sb6+?
      • 1...Ke5
        • 2.Qd4#
        • 2.Qf4#
      • 1...Kc5!
    • 1.Sf6+?
      • 1...Ke5
        • 2.Qb5#
        • 2.Qa1#
        • 2.Qd4#
        • 2.Qf4#
        • 2.Qa5#
      • 1...Kc5!
    • 1.Sb8?
      • threat
        • 2.Qd4#
      • 1...Ke5
        • 2.Qd4#
      • 1...Kc5!
  • Keys
    • 1.Se5!
      • threat
        • 2.Qd4#
      • 1...Kc5
        • 2.Qa5#
      • 1...Kxe5
        • 2.Qd4#

This anticipates 21487(1919), 178231(2007)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • P(b);N_GUARD::P(A)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(C);CHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(C);
      • Threat
        • QAR1(B)
      • Vars
        • K(a);P-FLIGHT::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • S(C);
    • Threat
      • QAR1(B)
    • Vars
      • K(a);P-FLIGHT::QAR2(B)
      • K(a);P-FLIGHT,XS(C)::QAB1(B)
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