MESON Chess Problem Database

Problem Display
PID: 133356 (1rb2Q2/n7/5pp1/1p1pN1P1/2pk2B1/n1R1NP2/1P5B/3K4 w - - 0 1)

Pankratiev, Aleksandr Nikolaevich

1/3 Prize, CXBH-50 JT, 1991

1rb2Q2/n7/5pp1/1p1pN1P1/2pk2B1/n1R1NP2/1P5B/3K4

#2

10 + 10

1077 Boletim da UBP 1992
6490 yacpdb 2009
5503 ISC 2012
56 The Problemist 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.Sc2#
    • 1...Sc2
      • 2.Sxc2#
    • 1...Sc6
      • 2.Sxc6#
  • Tries
    • 1.S3xc4?
      • threat
        • 2.Bg1#
        • 2.Rd3#
      • 1...Sxc4
        • 2.Rd3#
      • 1...dxc4
        • 2.Qd6#
      • 1...fxe5
        • 2.Bg1#
        • 2.Bxe5#
      • 1...Bf5
        • 2.Bg1#
      • 1...Sc2
        • 2.Rd3#
      • 1...bxc4!
    • 1.Sd7?
      • threat
        • 2.Qc5#
        • 2.Qxf6#
      • 1...fxg5
        • 2.Be5#
        • 2.Qc5#
        • 2.Qg7#
        • 2.Qf6#
        • 2.Qh8#
      • 1...Rb6
        • 2.Qc5#
      • 1...Sc6
        • 2.Qc5#
      • 1...f5
        • 2.Be5#
        • 2.Qc5#
        • 2.Qg7#
        • 2.Qf6#
        • 2.Qh8#
      • 1...Bxd7!
    • 1.Bg1?
      • threat
        • 2.S3xc4#
      • 1...Kxe5
        • 2.Qxf6#
      • 1...Sc2!
    • 1.Qd6?
      • threat
        • 2.Qxd5#
      • 1...Bb7
        • 2.Qb6#
      • 1...Be6!
    • 1.Qxf6?
      • threat
        • 2.Sd7#
      • 1...Kc5
        • 2.Sd3#
      • 1...Rb6
        • 2.Qxb6#
      • 1...Bd7
        • 2.Sxd7#
      • 1...Sc6!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Qc5#
      • 1...Kxe3
        • 2.Bg1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • S(a);N_GUARD::S(E)
    • S(a);N_GUARD::S(E),XS(a)
    • S(h);N_GUARD::S(H),XS(h)
  • Tries
    • Try
      • S(E);XP(b)
      • Threat
        • DUALS(2)
      • Vars
        • S(a);XS(E)::R1(D)
        • P(e);OGATEB,XS(E)::QAR2(J)
        • B(j);::B(C)
        • S(a);::R1(D)
      • Refutation
        • P(d);XS(E)
    • Try
      • S(H);
      • Threat
        • DUALS(2)
      • Vars
        • R(i);::QAB1(J)
        • S(h);::QAB1(J)
      • Refutation
        • B(j);XS(H)
    • Try
      • B(C);
      • Threat
        • B(C)+S(E),XP(b)
      • Vars
        • K(c);OGATEB,S_FLIGHT,XS(H)::QAB1(J),XP(f)
      • Refutation
        • S(a);
    • Try
      • Q(J);P_PINP(e)
      • Threat
        • QAR1(J),XP(e)
      • Vars
        • B(j);S_CUTR(i)::QAB(J)
      • Refutation
        • B(j);
    • Try
      • Q(J);XP(f)
      • Threat
        • QAB(J)+S(H)
      • Vars
        • K(c);P_SPINP(b),S_FLIGHT::S(H)
        • R(i);N_GUARD::QAB(J),XR(i)
        • B(j);::QAB(J)+S(H),XB(j)
      • Refutation
        • S(h);
  • Actual
    • S(H);
    • Threat
      • QAB1(J)
    • Vars
      • K(c);OGATEB,S_FLIGHT,XS(E)::B(C)
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