MESON Chess Problem Database

Problem Display
PID: 170905 (8/3K3b/p7/Rn1k1nR1/1Pp1pB2/P1pNP1p1/3N4/b2Q3r w - - 0 1)

Lobusov, Andrey Jakovlevic

1st Prize, Problemisten, 1980

8/3K3b/p7/Rn1k1nR1/1Pp1pB2/P1pNP1p1/3N4/b2Q3r

#2

10 + 11

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bg8
      • 2.Rxf5#
    • 1...cxd3
      • 2.Qb3#
    • 1...exd3
      • 2.Qf3#
  • Tries
    • 1.Sf1?
      • threat
        • 2.Sc1#
        • 2.Se1#
        • 2.Sb2#
        • 2.Sf2#
      • 1...Rxf1
        • 2.Se1#
      • 1...cxd3
        • 2.Qb3#
      • 1...exd3
        • 2.Qf3#
      • 1...Rh2
        • 2.Sf2#
      • 1...Bb2
        • 2.Sc1#
        • 2.Se1#
        • 2.Sxb2#
        • 2.Sf2#
      • 1...c2!
    • 1.Sxe4?
      • threat
        • 2.Sf6#
      • 1...Kxe4
        • 2.Sc5#
      • 1...cxd3
        • 2.Qxd3#
      • 1...Rh6
        • 2.Sdf2#
      • 1...c2!
  • Keys
    • 1.Sxc4!
      • threat
        • 2.Sb6#
      • 1...Kxc4
        • 2.Se5#
      • 1...exd3
        • 2.Qxd3#
      • 1...Rh6
        • 2.Sdb2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(k);N_GUARD::R(I),XS(i)
    • P(e);OGATEB,XS(D)::QAB(A)
    • P(f);OGATEB,XS(D)::QAB(A)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(4)
      • Vars
        • R(b);XS(B)::QAR(A)+S(D)
        • P(e);OGATEB,P_SPINP(e),XS(D)::QAB(A)
        • P(f);OGATEB,P_SPINP(f),XS(D)::QAB(A)
        • R(b);::QAR(A)+S(D)
      • Refutation
        • P(c);
    • Try
      • S(B);XP(f)
      • Threat
        • S(B)
      • Vars
        • K(h);N_SPINS(g),S_FLIGHT,XS(B)::S(D)
        • P(e);OGATE,P_SPINP(e),XS(D)::QAR2(A),XP(e)
        • R(b);N_GUARD::QAR(A)+S(D)
      • Refutation
        • P(c);
  • Actual
    • S(B);XP(e)
    • Threat
      • S(B)
    • Vars
      • K(h);N_SPINS(g),S_FLIGHT,XS(B)::S(D)
      • P(f);OGATE,P_SPINP(f),XS(D)::QAR2(A),XP(f)
      • R(b);N_GUARD::QAR(A)+S(D)
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