MESON Chess Problem Database

Problem Display
PID: 213817 (n4B2/8/3N3R/3k1PK1/1p2pP2/b1R1P3/1N1rp1n1/7Q w - - 0 1)

Pankratiev, Aleksandr Nikolaevich

Suomen Shakki, 1999

n4B2/8/3N3R/3k1PK1/1p2pP2/b1R1P3/1N1rp1n1/7Q

#2

10 + 8

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Se1
      • 2.Qxe4#
    • 1...Sxe3
      • 2.Qxe4#
    • 1...Sxf4
      • 2.Qxe4#
    • 1...Sh4
      • 2.Qxe4#
  • Tries
    • 1.Sb5?
      • threat
        • 2.Rc5#
        • 2.Rd6#
      • 1...Sxf4
        • 2.Rc5#
      • 1...bxc3
        • 2.Sxc3#
      • 1...Rc2
        • 2.Rd6#
      • 1...b3!
    • 1.Se8?
      • threat
        • 2.Sf6#
        • 2.Rc5#
        • 2.Rd6#
      • 1...Sxe3
        • 2.Rd6#
      • 1...Sxf4
        • 2.Rc5#
      • 1...b3
        • 2.Sf6#
      • 1...Rc2
        • 2.Sf6#
        • 2.Rd6#
      • 1...bxc3!
    • 1.Re6?
      • threat
        • 2.Re5#
      • 1...Sxe3
        • 2.Qxe4#
      • 1...Sxf4
        • 2.Qxe4#
      • 1...bxc3!
  • Keys
    • 1.Sxe4!
      • threat
        • 2.Sf6#
      • 1...Kxe4
        • 2.Qxg2#
      • 1...Sxe3
        • 2.Rd6#
      • 1...Sxf4
        • 2.Rc5#
      • 1...bxc3
        • 2.Sxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • S(c);OGATE,P_SPINP(f)::QAB1(A),XP(f)
    • S(c);OGATE,P_SPINP(f),XP(D)::QAB1(A),XP(f)
    • S(c);OGATE,P_SPINP(f),XP(E)::QAB1(A),XP(f)
  • Tries
    • Try
      • S(H);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);P_SPINP(f),XP(E)::R1(C)
        • P(e);XR(C)::S(H),XP(e)
        • R(a);::R1(I)
      • Refutation
        • P(e);
    • Try
      • S(H);
      • Threat
        • DUALS(3)
      • Vars
        • S(c);P_SPINP(f),XP(D)::R1(I)
        • S(c);P_SPINP(f),XP(E)::R1(C)
        • P(e);::S(H)
      • Refutation
        • P(e);XR(C)
    • Try
      • R(I);
      • Threat
        • R1(I)
      • Vars
        • S(c);OGATE,P_SPINP(f),XP(D)::QAB1(A),XP(f)
        • S(c);OGATE,P_SPINP(f),XP(E)::QAB1(A),XP(f)
      • Refutation
        • P(e);XR(C)
  • Actual
    • S(H);XP(f)
    • Threat
      • S(H)
    • Vars
      • K(g);OGATEB,P_SPINS(c),S_FLIGHT,XS(H)::QAB(A),XS(c)
      • S(c);XP(D)::R1(I)
      • S(c);XP(E)::R1(C)
      • P(e);XR(C)::S(H),XP(e)
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