MESON Chess Problem Database

Problem Display
PID: 227806 (4K3/8/8/4n3/1N1N4/2BPknQ1/8/8 w - - 0 1)

Sonnenfeld, Pal

Revista de Sah, 1926

4K3/8/8/4n3/1N1N4/2BPknQ1/8/8

#2

6 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sxd3
      • 2.Qxf3#
    • 1...Sc4
      • 2.Qxf3#
    • 1...Sg4
      • 2.Qxf3#
    • 1...Sc6
      • 2.Qxf3#
    • 1...Sg6
      • 2.Qxf3#
    • 1...Sd7
      • 2.Qxf3#
    • 1...Sf7
      • 2.Qxf3#
  • Tries
    • 1.Sa2?
      • 1...Sxd3
        • 2.Qxf3#
      • 1...Sc4
        • 2.Qxf3#
      • 1...Sg4
        • 2.Qxf3#
      • 1...Sc6
        • 2.Qxf3#
      • 1...Sg6
        • 2.Qxf3#
      • 1...Sd7
        • 2.Qxf3#
      • 1...Sf7
        • 2.Qxf3#
      • 1...Kxd3!
    • 1.Sa6?
      • 1...Sxd3
        • 2.Qxf3#
      • 1...Sc4
        • 2.Qxf3#
      • 1...Sg4
        • 2.Qxf3#
      • 1...Sc6
        • 2.Qxf3#
      • 1...Sg6
        • 2.Qxf3#
      • 1...Sd7
        • 2.Qxf3#
      • 1...Sf7
        • 2.Qxf3#
      • 1...Kxd3!
    • 1.Sbc6?
      • 1...Sxd3
        • 2.Qxf3#
      • 1...Sxc6
        • 2.Qxf3#
      • 1...Sc4
        • 2.Qxf3#
      • 1...Sg4
        • 2.Qxf3#
      • 1...Sg6
        • 2.Qxf3#
      • 1...Sd7
        • 2.Qxf3#
      • 1...Sf7
        • 2.Qxf3#
      • 1...Kxd3!
    • 1.Bd2+?
      • 1...Kxd4
        • 2.Qf2#
      • 1...Kxd2!
    • 1.Qg1+?
      • 1...Kf4
        • 2.Sd5#
      • 1...Sxg1!
  • Keys
    • 1.Qg2!
      • 1...Kf4
        • 2.Sd5#
      • 1...Sxd4
        • 2.Bd2#
      • 1...Sxd3
        • 2.Qxf3#
      • 1...Se1
        • 2.Qd2#
      • 1...Sg1
        • 2.Qd2#
      • 1...Sd2
        • 2.Qxd2#
      • 1...Sh2
        • 2.Qd2#
      • 1...Sh4
        • 2.Qd2#
      • 1...Sg5
        • 2.Qd2#
      • 1...Sc4
        • 2.Qxf3#
      • 1...Sg4
        • 2.Qxf3#
      • 1...Sc6
        • 2.Qxf3#
      • 1...Sg6
        • 2.Qxf3#
      • 1...Sd7
        • 2.Qxf3#
      • 1...Sf7
        • 2.Qxf3#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD,XP(B)::QAR1(C),XS(b)
    • S(c);N_GUARD::QAR1(C),XS(b)
  • Tries
    • Try
      • S(D);
      • Vars
        • S(c);N_GUARD,SBLOCK,XP(B)::QAR1(C),XS(b)
        • S(c);N_GUARD::QAR1(C),XS(b)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
    • Try
      • S(D);
      • Vars
        • S(c);N_GUARD,SBLOCK,XP(B)::QAR1(C),XS(b)
        • S(c);N_GUARD::QAR1(C),XS(b)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
    • Try
      • S(D);
      • Vars
        • S(c);N_GUARD,SBLOCK,XP(B)::QAR1(C),XS(b)
        • S(c);N_GUARD,XS(D)::QAR1(C),XS(b)
        • S(c);N_GUARD::QAR1(C),XS(b)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
    • Try
      • B(A);CHECK
      • Vars
        • K(a);N_SPINS(b),S_FLIGHT,XS(E)::QAB(C)
      • Refutation
        • K(a);N_SPINS(b),S_FLIGHT,XB(A)
    • Try
      • Q(C);CHECK,N_PINS(b)
      • Vars
        • K(a);S_FLIGHT::S(D)
      • Refutation
        • S(b);XQ(C)
  • Actual
    • Q(C);N_PINS(b)
    • Vars
      • K(a);S_FLIGHT::S(D)
      • S(b);N_GUARD,SBLOCK,XS(E)::B(A)
      • S(c);N_GUARD,XP(B)::QAR1(C),XS(b)
      • S(b);N_GUARD::QAB1(C)
      • S(b);N_GUARD::QAB1(C),XS(b)
      • S(c);N_GUARD::QAR1(C),XS(b)
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