MESON Chess Problem Database

Problem Display
PID: 229389 (8/3p4/6Q1/8/N7/8/1bK5/k7 w - - 0 1)

Borisenko, Alexey Ivanovich

Krepko, Piotr Andrinovich

Sachova skladba, 1987

8/3p4/6Q1/8/N7/8/1bK5/k7

#2

3 + 3

5454 Near Snap 2021
6490 yacpdb 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Sxb2?
      • threat
        • 2.Qa6#
      • 1...Ka2
        • 2.Qa6#
      • 1...d6!
    • 1.Qa6?
      • threat
        • 2.Sxb2#
      • 1...Ka2
        • 2.Sxb2#
        • 2.Sc3#
      • 1...Bc1
        • 2.Sb2#
      • 1...Bc3
        • 2.Sxc3#
      • 1...Bd4
        • 2.Sb2#
        • 2.Sc3#
        • 2.Sc5#
        • 2.Sb6#
      • 1...Be5
        • 2.Sb2#
        • 2.Sc3#
        • 2.Sc5#
        • 2.Sb6#
      • 1...Bf6
        • 2.Sb2#
        • 2.Sc3#
        • 2.Sc5#
        • 2.Sb6#
      • 1...Bg7
        • 2.Sb2#
        • 2.Sc3#
        • 2.Sc5#
        • 2.Sb6#
      • 1...Bh8
        • 2.Sb2#
        • 2.Sc3#
        • 2.Sc5#
        • 2.Sb6#
      • 1...Ba3!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Qxb2#
      • 1...Ka2
        • 2.Qxb2#
      • 1...Bc1
        • 2.Qb1#
      • 1...Ba3
        • 2.Qb1#
      • 1...Bc3
        • 2.Qb1#
      • 1...Bd4
        • 2.Qb1#
      • 1...Be5
        • 2.Qb1#
      • 1...Bf6
        • 2.Qb1#
      • 1...Bg7
        • 2.Qb1#
      • 1...Bh8
        • 2.Qb1#

This anticipates 246069(1988)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);XB(b)
      • Threat
        • QAR(C)
      • Vars
        • K(a);P-FLIGHT::QAR(C)
      • Refutation
        • P(c);
    • Try
      • Q(C);
      • Threat
        • QAR(C)+S(B),XB(b)
      • Vars
        • B(b);::QAR(C)+S(B)
        • B(b);N_GUARD::QAR(C)+S(B),XB(b)
      • Refutation
        • B(b);
  • Actual
    • Q(C);
    • Threat
      • QAB1(C),XB(b)
    • Vars
      • K(a);P-FLIGHT::QAR1(C),XB(b)
      • B(b);OGATE::QAR1(C)
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