MESON Chess Problem Database

Problem Display
PID: 172295 (8/7n/8/8/4NQ2/7k/8/4b2K w - - 0 1)

Andreev, Aleksandr Grigorevich

Vecherni Krasnodar, 1996

8/7n/8/8/4NQ2/7k/8/4b2K

#2

3 + 3

6490 yacpdb 2018
3713 Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bd2
      • 2.Sf2#
      • 2.Qg3#
    • 1...Bf2
      • 2.Sxf2#
    • 1...Bc3
      • 2.Sf2#
      • 2.Qg3#
    • 1...Bg3
      • 2.Qxg3#
    • 1...Bb4
      • 2.Sf2#
      • 2.Qg3#
    • 1...Bh4
      • 2.Qf5#
    • 1...Ba5
      • 2.Sf2#
      • 2.Qg3#
    • 1...Sg5
      • 2.Sxg5#
    • 1...Sf6
      • 2.Sg5#
    • 1...Sf8
      • 2.Sg5#
  • Tries
    • 1.Sf6?
      • threat
        • 2.Qh2#
        • 2.Qg4#
      • 1...Bg3
        • 2.Qg4#
      • 1...Sxf6!
    • 1.Qh6+?
      • 1...Bh4
        • 2.Qe6#
      • 1...Kg4!
    • 1.Qf3+?
      • 1...Bg3
        • 2.Qxg3#
      • 1...Kh4!
  • Keys
    • 1.Kg1!
      • 1...Bf2+
        • 2.Sxf2#
      • 1...Bd2
        • 2.Sf2#
        • 2.Qg3#
      • 1...Bc3
        • 2.Sf2#
        • 2.Qg3#
      • 1...Bg3
        • 2.Qxg3#
      • 1...Bb4
        • 2.Sf2#
        • 2.Qg3#
      • 1...Bh4
        • 2.Qf5#
      • 1...Ba5
        • 2.Sf2#
        • 2.Qg3#
      • 1...Sg5
        • 2.Sxg5#
      • 1...Sf6
        • 2.Sg5#
      • 1...Sf8
        • 2.Sg5#

Anticipated by 219457(1990)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • B(a);N_GUARD::S(B),XB(a)
    • B(a);N_GUARD::QAR1(C),XB(a)
    • B(a);SBLOCK::QAB(C)
    • S(c);N_GUARD::S(B),XS(c)
    • S(c);N_GUARD::S(B)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::QAB1(C)
      • Refutation
        • S(c);XS(B)
    • Try
      • Q(C);CHECK
      • Vars
        • B(a);P_SPINB(a),SBLOCK::QAB(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR1(C),XB(a)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • K(A);P-FLIGHT
    • Vars
      • B(a);CHECK,N_GUARD::S(B),XB(a)
      • B(a);N_GUARD::QAR1(C),XB(a)
      • B(a);SBLOCK::QAB(C)
      • S(c);N_GUARD::S(B),XS(c)
      • S(c);N_GUARD::S(B)
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