MESON Chess Problem Database

Problem Display
PID: 60544 (8/K7/3pp3/4p3/2R1R1Np/3kN2p/n3pQ1p/4B1qr w - - 0 1)

Lider, Valentin Viktorovich

1st Prize, Stella Polaris 08. TT, 1971

8/K7/3pp3/4p3/2R1R1Np/3kN2p/n3pQ1p/4B1qr

#2

7 + 11

274 diagrammes 1973
3753 FIDE Album (1971-1973) 1978

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf2
      • 2.Sxf2#
    • 1...d5
      • 2.Sxe5#
  • Tries
    • 1.Sd5?
      • 1...Qxf2+
        • 2.Sxf2#
      • 1...Qxe1
        • 2.Qe3#
      • 1...Qxg4
        • 2.Qe3#
      • 1...Sc3
        • 2.Sb4#
      • 1...Qf1
        • 2.Qe3#
      • 1...Qg2
        • 2.Qe3#
      • 1...Qg3
        • 2.Qxe2#
      • 1...Sc1
        • 2.Sb4#
      • 1...Sb4
        • 2.Sxb4#
      • 1...exd5!
    • 1.Qf3?
      • 1...Qxe3+
        • 2.Qxe3#
      • 1...Qxe1
        • 2.Sf1#
      • 1...Qxg4
        • 2.Sxg4#
      • 1...Qf2
        • 2.Sxf2#
      • 1...Qf1
        • 2.Sxf1#
      • 1...Qg2
        • 2.Sxg2#
      • 1...Sc1
        • 2.Rc3#
      • 1...Sc3
        • 2.Rxc3#
      • 1...Sb4
        • 2.Rc3#
      • 1...d5
        • 2.Sxe5#
      • 1...Qg3!
  • Keys
    • 1.Sc2!
      • 1...Qxf2+
        • 2.Sxf2#
      • 1...Qxe1
        • 2.Qe3#
      • 1...Qxg4
        • 2.Qe3#
      • 1...Sc3
        • 2.Sb4#
      • 1...Qf1
        • 2.Qe3#
      • 1...Qg2
        • 2.Qe3#
      • 1...Qg3
        • 2.Qxe2#
      • 1...Sc1
        • 2.Sb4#
      • 1...Sb4
        • 2.Sxb4#
      • 1...d5
        • 2.Sxe5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • Q(a);P_PINS(C),XQ(B)::S(F),XQ(a)
    • P(j);N_GUARD::S(F),XP(i)
  • Tries
    • Try
      • S(C);P_SPINQ(B)
      • Vars
        • Q(a);CHECK,XQ(B)::S(F),XQ(a)
        • Q(a);N_GUARD,N_PINQ(B),XB(A)::QAR1(B)
        • Q(a);N_GUARD,N_PINQ(B),XS(F)::QAR1(B)
        • S(c);N_GUARD::S(C)
        • Q(a);N_GUARD,N_PINQ(B)::QAR1(B)
        • Q(a);N_PINQ(B)::QAB1(B),XP(d)
        • S(c);N_GUARD::S(C),XS(c)
      • Refutation
        • P(k);XS(C)
    • Try
      • Q(B);P_SPINS(C)
      • Vars
        • Q(a);CHECK,OGATE,P_SPINQ(a),XS(C)::QAR1(B),XQ(a)
        • Q(a);N_PINS(C),XB(A)::QAR(B)+S(C)
        • Q(a);N_PINS(C),XS(F)::QAR(B)+S(C),XQ(a)
        • Q(a);N_GUARD::S(F),XQ(a)
        • Q(a);N_PINS(C)::QAR(B)+S(C),XQ(a)
        • S(c);N_GUARD::R1(D)
        • S(c);N_GUARD::R1(D),XS(c)
        • P(j);N_GUARD::S(F),XP(i)
      • Refutation
        • Q(a);N_PINS(C)
  • Actual
    • S(C);P_SPINQ(B)
    • Vars
      • Q(a);CHECK,XQ(B)::S(F),XQ(a)
      • Q(a);N_GUARD,N_PINQ(B),XB(A)::QAR1(B)
      • Q(a);N_GUARD,N_PINQ(B),XS(F)::QAR1(B)
      • S(c);N_GUARD::S(C)
      • Q(a);N_GUARD,N_PINQ(B)::QAR1(B)
      • Q(a);N_PINQ(B)::QAB1(B),XP(d)
      • S(c);N_GUARD::S(C),XS(c)
      • P(j);N_GUARD::S(F),XP(i)
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