MESON Chess Problem Database

Problem Display
PID: 267807 (BB2Q1bb/1N1n3q/4pp1p/n1P3P1/R1N1k1r1/4p1p1/6K1/3R4 w - - 0 1)

Lobusov, Andrey Jakovlevic

diagrammes, 1976

BB2Q1bb/1N1n3q/4pp1p/n1P3P1/R1N1k1r1/4p1p1/6K1/3R4

#2

10 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qf5
      • 2.Scxa5#
    • 1...Rf4
      • 2.Sbd6#
    • 1...Se5
      • 2.Scd6#
    • 1...e5
      • 2.Scd6#
    • 1...f5
      • 2.Sbxa5#
  • Tries
    • 1.Qg6+?
      • 1...f5
        • 2.Sbxa5#
      • 1...Qxg6!
    • 1.Qxe6+?
      • 1...Se5
        • 2.Scxa5#
        • 2.Scd6#
      • 1...Bxe6!
  • Keys
    • 1.Qh5!
      • threat
        • 2.Qxg4#
      • 1...Kf5
        • 2.Sxe3#
      • 1...Rxg5
        • 2.Qf3#
      • 1...Se5
        • 2.Scd6#
      • 1...Qf5
        • 2.Scxa5#
      • 1...Rf4
        • 2.Sbd6#
      • 1...Rh4
        • 2.Qf3#
      • 1...f5
        • 2.Sbxa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(j);SBLOCK::R(C)+S(D),XS(e)
    • R(d);SBLOCK::B(H)+S(G),DCHECK
    • S(i);N_SPINP(f),SBLOCK::R(C)+S(D),DCHECK
    • P(f);::R(C)+S(D),DCHECK
    • P(g);SBLOCK::B(H)+S(G),XS(e)
  • Tries
    • Try
      • Q(J);CHECK,N_PINP(f)
      • Vars
        • P(g);P_SPINP(g)::B(H)+S(G),XS(e)
      • Refutation
        • Q(j);XQ(J)
    • Try
      • Q(J);CHECK,XP(f)
      • Refutation
        • B(k);XQ(J)
  • Actual
    • Q(J);N_PINP(f)
    • Threat
      • QAR2(J),XR(d)
    • Vars
      • K(c);N_GUARD,S_CUTS(e),S_FLIGHT::S(D),XP(a)
      • R(d);OGATE,XP(F)::QAB1(J)
      • S(i);SBLOCK::R(C)+S(D),DCHECK
      • Q(j);SBLOCK::R(C)+S(D),XS(e)
      • R(d);SBLOCK::B(H)+S(G),DCHECK
      • R(d);OGATE::QAB1(J)
      • P(g);SBLOCK::B(H)+S(G),XS(e)
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