MESON Chess Problem Database

Problem Display
PID: 108865 (3R4/P4p1B/2N2Pr1/nK2p3/2P1k3/3p1R2/5P1n/7Q w - - 0 1)

Lena, Lucio

Il Littorale, 1931

3R4/P4p1B/2N2Pr1/nK2p3/2P1k3/3p1R2/5P1n/7Q

#2

10 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Sxa5?
      • threat
        • 2.a8Q#
        • 2.a8B#
      • 1...Sf1
        • 2.a8Q#
        • 2.a8B#
      • 1...Sg4
        • 2.a8Q#
        • 2.a8B#
      • 1...d2
        • 2.a8Q#
        • 2.a8B#
      • 1...Sxf3!
    • 1.Rf5+?
      • 1...Rg2
        • 2.Qe1#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Kxf5!
    • 1.Qd1?
      • threat
        • 2.Qxd3#
      • 1...d2
        • 2.Qe2#
      • 1...Sxf3!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Qe1#
      • 1...Sxf3
        • 2.Qxf3#
      • 1...Sxc4
        • 2.a8Q#
        • 2.a8B#
      • 1...exd4
        • 2.Re8#
      • 1...Sf1
        • 2.Qh4#
      • 1...Sg4
        • 2.Rf5#
      • 1...d2
        • 2.Qb1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(F);XS(d)
      • Threat
        • P=Q
      • Vars
        • S(a);::P=Q
        • P(b);::P=Q
      • Refutation
        • S(a);P_SPINS(a),XR(C)
    • Try
      • R(C);CHECK,N_PINR(f)
      • Vars
        • R(f);P_SPINR(f)::QAR(A)
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • K(c);P_SPINR(f),S_FLIGHT,XR(C)
    • Try
      • Q(A);
      • Threat
        • QAB1(A),XP(b)
      • Vars
        • P(b);N_GUARD::QAR2(A)
      • Refutation
        • S(a);XR(C)
  • Actual
    • S(F);
    • Threat
      • QAR(A)
    • Vars
      • S(a);OGATE,P_SPINS(a),XR(C)::QAB1(A),XS(a)
      • S(d);N_GUARD,XP(D)::P=Q
      • P(e);OGATEB,SBLOCK,XS(F)::R(J)
      • S(a);OGATE::QAR(A)
      • S(a);N_GUARD::QAB(A)+R(C)
      • P(b);OGATEB::QAB(A)
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