MESON Chess Problem Database

Problem Display
PID: 22560 (8/1nKB1p2/8/1p1kp3/2R1R3/2PP2P1/P3PP2/3Q4 w - - 0 1)

Neptaev, Nikolai I

Vecherni Leningrad, 1989

8/1nKB1p2/8/1p1kp3/2R1R3/2PP2P1/P3PP2/3Q4

#2

11 + 5

SOLUTION

  • SOUND
  • Tries
    • 1.Rcd4+?
      • 1...Kc5
        • 2.Rxe5#
      • 1...exd4!
    • 1.Rc5+?
      • 1...Kxc5
        • 2.Rxe5#
      • 1...Sxc5!
    • 1.Qb3?
      • threat
        • 2.Rc6#
      • 1...bxc4
        • 2.Qxc4#
      • 1...Sa5
        • 2.Qxb5#
      • 1...Sc5
        • 2.Rcd4#
      • 1...Sd6!
    • 1.f4?
      • threat
        • 2.Rxe5#
      • 1...exf4
        • 2.Bc6#
      • 1...f6!
  • Keys
    • 1.d4!
      • threat
        • 2.dxe5#
      • 1...Kxc4
        • 2.Qb3#
      • 1...Kxe4
        • 2.Qh1#
      • 1...bxc4
        • 2.Rxe5#
      • 1...exd4
        • 2.Qxd4#
      • 1...Sc5
        • 2.dxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(H);CHECK
      • Vars
        • K(b);P-FLIGHT::R(I),XP(c)
      • Refutation
        • P(c);XR(H)
    • Try
      • R(H);CHECK
      • Vars
        • K(b);P-FLIGHT,XR(H)::R(I),XP(c)
      • Refutation
        • S(d);XR(H)
    • Try
      • Q(A);
      • Threat
        • QAB(A)+R(H)
      • Vars
        • P(a);OGATE,P_SPINP(a),XR(H)::QAB1(A),XP(a)
        • S(d);N_GUARD::QAR2(A),XP(a)
        • S(d);SBLOCK::QAB(A)+R(H),DCHECK
      • Refutation
        • S(d);
    • Try
      • P(D);
      • Threat
        • R1(I),XP(c)
      • Vars
        • P(c);XP(D)::B(K)
      • Refutation
        • P(e);
  • Actual
    • P(F);
    • Threat
      • QAR(A)+P(F),XP(c)
    • Vars
      • K(b);OGATEB,S_FLIGHT,XR(H)::QAB1(A)
      • K(b);OGATEB,S_FLIGHT,XR(I)::QAB(A)
      • P(a);SBLOCK,XR(H)::R1(I),XP(c)
      • P(c);OGATE,P_SPINP(c),XP(F)::QAR1(A),XP(c)
      • S(d);OGATE::QAR(A)+P(F),XS(d)
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