MESON Chess Problem Database

Problem Display
PID: 161906 (8/5p1N/2K1N3/4k3/6Q1/8/7b/8 w - - 0 1)

Surkov, Valery Albertovich

Sachmatija, 2009

8/5p1N/2K1N3/4k3/6Q1/8/7b/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...f5
      • 2.Qe2#
  • Tries
    • 1.Qf3?
      • threat
        • 2.Qd5#
      • 1...Kxe6
        • 2.Qf6#
      • 1...fxe6!
    • 1.Qd4+?
      • 1...Kxe6
        • 2.Qf6#
      • 1...Kf5!
    • 1.Qf4+?
      • 1...Kxe6
        • 2.Qf6#
      • 1...Bxf4!
    • 1.Qg5+?
      • 1...Kxe6
        • 2.Sf8#
        • 2.Qf6#
      • 1...f5
        • 2.Qe3#
      • 1...Ke4!
  • Keys
    • 1.Shf8!
      • threat
        • 2.Sd7#
      • 1...Kf6
        • 2.Qg5#
      • 1...Bf4
        • 2.Qxf4#
      • 1...f5
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(c);SBLOCK::QAR(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(b);P-FLIGHT,XS(C)::QAR1(A)
      • Refutation
        • P(c);XS(C)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT,XS(C)::QAR1(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT,XS(C)::QAR1(A)
      • Refutation
        • B(a);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • P(c);P_SPINP(c),SBLOCK::QAR2(A)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • K(b);S_FLIGHT::QAB1(A)
      • B(a);N_GUARD::QAB1(A),XB(a)
      • P(c);SBLOCK::QAB1(A)
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