MESON Chess Problem Database

Problem Display
PID: 133354 (B1K5/pQ6/2R1N3/3pPp2/2NPkpP1/2b2nq1/4Prn1/r5B1 w - - 0 1)

Pankratiev, Aleksandr Nikolaevich

3rd Prize, Ranok, 1989

B1K5/pQ6/2R1N3/3pPp2/2NPkpP1/2b2nq1/4Prn1/r5B1

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rb1
      • 2.Qxb1#
    • 1...Ra3
      • 2.Qb1#
    • 1...Ra4
      • 2.Qb1#
    • 1...Ra5
      • 2.Qb1#
    • 1...Ra6
      • 2.Qb1#
    • 1...Rf1
      • 2.Sd6#
      • 2.Sc5#
    • 1...Rxe2
      • 2.Sc5#
    • 1...Se3
      • 2.Sd6#
    • 1...Sxd4
      • 2.Sc5#
      • 2.Sg5#
    • 1...fxg4
      • 2.Qh7#
  • Tries
    • 1.Rc5?
      • threat
        • 2.Qxd5#
      • 1...fxg4
        • 2.Qh7#
      • 1...Se3
        • 2.Sd6#
      • 1...Rxe2!
    • 1.Rb6?
      • threat
        • 2.Qxd5#
      • 1...Rxe2
        • 2.Sc5#
      • 1...fxg4
        • 2.Qh7#
      • 1...Se3
        • 2.Sd6#
      • 1...Ra5!
    • 1.Rd6?
      • threat
        • 2.Qxd5#
      • 1...Rxe2
        • 2.Sc5#
      • 1...fxg4
        • 2.Qh7#
      • 1...Ra5
        • 2.Qb1#
      • 1...Se3!
    • 1.Rc7?
      • threat
        • 2.Qxd5#
      • 1...Rxe2
        • 2.Sc5#
      • 1...Ra5
        • 2.Qb1#
      • 1...Se3
        • 2.Sd6#
      • 1...fxg4!
  • Keys
    • 1.Ra6!
      • threat
        • 2.Qxd5#
      • 1...Rxe2
        • 2.Sc5#
      • 1...fxg4
        • 2.Qh7#
      • 1...Ra5
        • 2.Qb1#
      • 1...Se3
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • R(a);N_GUARD::QAB(I),XR(a)
    • R(a);N_GUARD::QAB(I)
    • R(b);XP(B)::S(H)
    • S(c);SBLOCK::S(C)
    • P(j);OGATEB,XP(E)::QAB(I)
  • Tries
    • Try
      • R(G);P_PINP(i)
      • Threat
        • QAB1(I),XP(i)
      • Vars
        • P(j);OGATEB,XP(E)::QAB(I)
        • S(c);SBLOCK::S(C)
      • Refutation
        • R(b);XP(B)
    • Try
      • R(G);P_PINP(i)
      • Threat
        • QAB1(I),XP(i)
      • Vars
        • R(b);XP(B)::S(H)
        • P(j);OGATEB,XP(E)::QAB(I)
        • S(c);SBLOCK::S(C)
      • Refutation
        • R(a);
    • Try
      • R(G);P_PINP(i)
      • Threat
        • QAB1(I),XP(i)
      • Vars
        • R(b);XP(B)::S(H)
        • P(j);OGATEB,XP(E)::QAB(I)
        • R(a);N_GUARD::QAB(I)
      • Refutation
        • S(c);
    • Try
      • R(G);P_PINP(i)
      • Threat
        • QAB1(I),XP(i)
      • Vars
        • R(b);XP(B)::S(H)
        • R(a);N_GUARD::QAB(I)
        • S(c);SBLOCK::S(C)
      • Refutation
        • P(j);XP(E)
  • Actual
    • R(G);P_PINP(i)
    • Threat
      • QAB1(I),XP(i)
    • Vars
      • R(b);XP(B)::S(H)
      • P(j);OGATEB,XP(E)::QAB(I)
      • R(a);N_GUARD::QAB(I)
      • S(c);SBLOCK::S(C)
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