MESON Chess Problem Database

Problem Display
PID: 180488 (8/1p6/8/2qr4/1p1kN1rQ/1B1NR1P1/P2p1P1p/2BR3K w - - 0 1)

Lider, Valentin Viktorovich

Comm., Shakhmaty v SSSR, 1983

8/1p6/8/2qr4/1p1kN1rQ/1B1NR1P1/P2p1P1p/2BR3K

#2

11 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qb6
      • 2.Bb2#
    • 1...Qd6
      • 2.Bb2#
    • 1...Qa7
      • 2.Bb2#
    • 1...Qe7
      • 2.Bb2#
    • 1...Qf8
      • 2.Bb2#
    • 1...Qa5
      • 2.Bb2#
    • 1...Qb5
      • 2.Bb2#
  • Tries
    • 1.Se5?
      • threat
        • 2.Sf3#
      • 1...Kxe5
        • 2.Qf6#
      • 1...Rxg3
        • 2.Sxg3#
      • 1...Rxe5
        • 2.Rxd2#
      • 1...Qf8
        • 2.Bb2#
      • 1...Rf4!
  • Keys
    • 1.Sc3!
      • threat
        • 2.Se2#
      • 1...Kxc3
        • 2.Bb2#
      • 1...Qxc3
        • 2.Qxg4#
      • 1...dxc1S
        • 2.Sxc1#
      • 1...bxc3
        • 2.Qxg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • Q(f);N_GUARD::B(A)
  • Tries
    • Try
      • S(G);P_PINP(a)
      • Threat
        • S(G)
      • Vars
        • K(d);N_SPINP(a),OGATEB,S_FLIGHT,XS(G)::QAB1(K)
        • R(e);XP(I)::QAR(K)+S(J),XR(e)
        • R(g);SBLOCK,XS(G)::R(B),XP(a)
        • Q(f);N_GUARD::B(A)
      • Refutation
        • R(e);
  • Actual
    • S(J);P_PINR(e)
    • Threat
      • S(J)
    • Vars
      • K(d);N_SPINR(e),OGATEB,S_FLIGHT,XS(J)::B(A)
      • Q(f);SBLOCK,XS(J)::QAR(K),XR(e)
      • P(a);XB(A)::R(B)+S(G),XS(a)
      • P(c);SBLOCK,XS(J)::QAR(K),XR(e)
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