MESON Chess Problem Database

Problem Display
PID: 7953 (8/N3pnp1/1pB1p1R1/1pk2p2/3R3K/1n1P4/1P2NQ2/8 w - - 0 1)

Ulanov, Lev

The Problemist, 1994

8/N3pnp1/1pB1p1R1/1pk2p2/3R3K/1n1P4/1P2NQ2/8

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.b4#
    • 1...Sc1
      • 2.b4#
    • 1...Sd2
      • 2.b4#
    • 1...Sxd4
      • 2.Qxd4#
    • 1...Sa5
      • 2.b4#
    • 1...Sd6
      • 2.Rc4#
    • 1...b4
      • 2.Rd5#
    • 1...e5
      • 2.Rc4#
  • Tries
    • 1.Sc1?
      • threat
        • 2.Sxb3#
      • 1...Sxc1
        • 2.b4#
      • 1...Sa1
        • 2.b4#
      • 1...Sd2
        • 2.b4#
      • 1...Sa5
        • 2.b4#
      • 1...Sxd4!
    • 1.Ra4+?
      • 1...Sd4
        • 2.Qxd4#
      • 1...Kd6!
    • 1.Re4+?
      • 1...Sd4
        • 2.Qxd4#
      • 1...Kd6!
    • 1.Rf4+?
      • 1...Sd4
        • 2.Qxd4#
      • 1...Kd6!
    • 1.Rdg4+?
      • 1...Sd4
        • 2.Qxd4#
      • 1...Kd6!
    • 1.Rd7+?
      • 1...Sd4
        • 2.Qxd4#
      • 1...Kb4!
    • 1.Rd8+?
      • 1...Sd4
        • 2.Qxd4#
      • 1...Kb4!
    • 1.Rxe6?
      • threat
        • 2.Rc4#
      • 1...Sxd4
        • 2.Qxd4#
      • 1...g5+!
    • 1.Qe1?
      • threat
        • 2.Qc3#
        • 2.Qb4#
      • 1...Se5
        • 2.Qb4#
      • 1...Sd2
        • 2.b4#
      • 1...Sa5
        • 2.Qb4#
        • 2.b4#
      • 1...Sd6
        • 2.Qb4#
      • 1...b4
        • 2.Qxb4#
      • 1...Sxd4!
    • 1.Qe3?
      • 1...Sxd4
        • 2.Qxd4#
      • 1...Se5
        • 2.Qxe5#
      • 1...Sa1
        • 2.b4#
      • 1...Sc1
        • 2.Qxc1#
        • 2.b4#
      • 1...Sd2
        • 2.b4#
      • 1...Sa5
        • 2.b4#
      • 1...Sg5
        • 2.Qe5#
      • 1...Sd6
        • 2.Rc4#
        • 2.Qe5#
      • 1...Sh6
        • 2.Qe5#
      • 1...Sd8
        • 2.Qe5#
      • 1...Sh8
        • 2.Qe5#
      • 1...b4
        • 2.Rd5#
      • 1...e5
        • 2.Rc4#
      • 1...f4!
  • Keys
    • 1.Qf4!
      • 1...Sxd4
        • 2.Qxd4#
      • 1...Se5
        • 2.Qxe5#
      • 1...Sa1
        • 2.b4#
      • 1...Sc1
        • 2.Qxc1#
        • 2.b4#
      • 1...Sd2
        • 2.b4#
      • 1...Sa5
        • 2.b4#
      • 1...Sg5
        • 2.Qe5#
      • 1...Sd6
        • 2.Qe5#
      • 1...Sh6
        • 2.Qe5#
      • 1...Sd8
        • 2.Qe5#
      • 1...Sh8
        • 2.Qe5#
      • 1...b4
        • 2.Rc4#
      • 1...e5
        • 2.Rd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 3
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • S(a);OGATE::P(A)
    • S(a);OGATE,P_SPINS(a),XR(E)::QAB1(C),XS(a)
    • S(h);SBLOCK::QAB(C)+R(E),DCHECK
    • P(b);SBLOCK::QAB(C)+R(E),DCHECK
    • P(f);::QAB(C)+R(E),DCHECK
  • Tries
    • Try
      • S(B);
      • Threat
        • S(B),XS(a)
      • Vars
        • S(a);OGATE,XS(B)::P(A)
        • S(a);OGATE::P(A)
      • Refutation
        • S(a);P_SPINS(a),XR(E)
    • Try
      • R(E);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(C),XS(a)
      • Refutation
        • K(c);P_SPINP(f),S_FLIGHT
    • Try
      • R(E);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(C),XS(a)
      • Refutation
        • K(c);P_SPINP(f),S_FLIGHT
    • Try
      • R(E);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(C),XS(a)
      • Refutation
        • K(c);P_SPINP(f),S_FLIGHT
    • Try
      • R(E);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(C),XS(a)
      • Refutation
        • K(c);P_SPINP(f),S_FLIGHT
    • Try
      • R(E);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(C),XS(a)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(E);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(C),XS(a)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(H);XP(f)
      • Threat
        • QAB(C)+R(E),DCHECK
      • Vars
        • S(a);OGATE,P_SPINS(a),XR(E)::QAB1(C),XS(a)
      • Refutation
        • P(i);CHECK
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • S(h);::QAB1(C)
        • S(a);OGATE::P(A)
        • P(b);::QAB1(C),XP(b)
      • Refutation
        • S(a);XR(E)
    • Try
      • Q(C);
      • Vars
        • S(a);OGATE,P_SPINS(a),XR(E)::QAB1(C),XS(a)
        • S(h);N_GUARD::QAR2(C),XS(h)
        • S(a);OGATE::P(A)
        • S(h);N_GUARD::QAR2(C)
        • P(b);SBLOCK::QAB(C)+R(E),DCHECK
        • P(f);::QAB(C)+R(E),DCHECK
      • Refutation
        • P(d);
  • Actual
    • Q(C);
    • Vars
      • S(a);OGATE,XR(E)::QAB1(C),XS(a)
      • S(h);N_GUARD::QAR2(C),XS(h)
      • S(a);OGATE::P(A)
      • S(h);N_GUARD::QAR2(C)
      • P(b);N_GUARD::R1(E)
      • P(f);N_GUARD::R1(E)
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