MESON Chess Problem Database

Problem Display
PID: 258485 (n1K1RB2/5PpQ/5P2/1PPk4/N6p/1Pp1p3/pp1PN3/1q1n4 w - - 0 1)

Leontieva, Nadezhda Aleksandrovna

Shakhmaty v SSSR, 1969

n1K1RB2/5PpQ/5P2/1PPk4/N6p/1Pp1p3/pp1PN3/1q1n4

#2

12 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3
      • 2.Qxd3#
    • 1...Qe4
      • 2.Qxe4#
    • 1...Qf5+
      • 2.Qxf5#
    • 1...Qa1
      • 2.Qd3#
      • 2.Qe4#
      • 2.Qf5#
    • 1...Qc1
      • 2.Qd3#
      • 2.Qe4#
      • 2.Qf5#
    • 1...Sf2
      • 2.Saxc3#
    • 1...Sb6+
      • 2.Sxb6#
    • 1...Sc7
      • 2.Sb6#
    • 1...c2
      • 2.Qd3#
      • 2.Qe4#
      • 2.Qf5#
  • Tries
    • 1.Bd6?
      • threat
        • 2.Re5#
      • 1...Qf5+
        • 2.Qxf5#
      • 1...Sb6+
        • 2.Sxb6#
      • 1...Qe4
        • 2.Qxe4#
      • 1...gxf6!
    • 1.Qh5+?
      • 1...Qf5+
        • 2.Qxf5#
      • 1...g5!
    • 1.dxe3?
      • threat
        • 2.Sf4#
      • 1...Qf5+
        • 2.Qxf5#
      • 1...Sb6+
        • 2.Sxb6#
      • 1...Sxe3
        • 2.Saxc3#
      • 1...Qe4
        • 2.Qxe4#
      • 1...g5!
    • 1.d3?
      • threat
        • 2.Qe4#
        • 2.Qf5#
      • 1...Sb6+
        • 2.Sxb6#
      • 1...Qxd3
        • 2.Qxd3#
      • 1...Sf2
        • 2.Saxc3#
        • 2.Qf5#
      • 1...g6!
    • 1.d4?
      • threat
        • 2.Re5#
      • 1...Qf5+
        • 2.Qxf5#
      • 1...Sb6+
        • 2.Sxb6#
      • 1...Qe4
        • 2.Qxe4#
      • 1...gxf6!
  • Keys
    • 1.dxc3!
      • threat
        • 2.Sf4#
        • 2.c4#
      • 1...Qf5+
        • 2.Qxf5#
      • 1...Sb6+
        • 2.Sxb6#
      • 1...Sxc3
        • 2.Saxc3#
      • 1...Qc2
        • 2.Sf4#
      • 1...Qd3
        • 2.Sf4#
        • 2.Qxd3#
      • 1...Qe4
        • 2.Qxe4#
      • 1...Qc1
        • 2.Sf4#
        • 2.Qd3#
        • 2.Qe4#
        • 2.Qf5#
      • 1...g5
        • 2.c4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(a);N_GUARD::QAR2(I),XQ(a)
    • Q(a);N_GUARD::QAB1(I),XQ(a)
    • Q(a);CHECK,N_GUARD::QAR2(I),XQ(a)
    • S(b);N_GUARD::S(D),XP(e)
    • S(j);CHECK,N_GUARD::S(D),XS(j)
    • S(j);N_GUARD::S(D)
  • Tries
    • Try
      • B(L);
      • Threat
        • R1(K)
      • Vars
        • Q(a);CHECK,N_GUARD::QAR2(I),XQ(a)
        • S(j);CHECK,N_GUARD::S(D),XS(j)
        • Q(a);N_GUARD::QAB1(I),XQ(a)
      • Refutation
        • P(i);XP(G)
    • Try
      • Q(I);CHECK
      • Vars
        • Q(a);CHECK,N_GUARD,P_SPINQ(a)::QAR2(I),XQ(a)
      • Refutation
        • P(i);P_SPINP(i)
    • Try
      • P(A);XP(f)
      • Threat
        • S(B)
      • Vars
        • Q(a);CHECK,N_GUARD::QAR2(I),XQ(a)
        • S(j);CHECK,N_GUARD::S(D),XS(j)
        • S(b);N_GUARD,XP(A)::S(D),XP(e)
        • Q(a);N_GUARD::QAB1(I),XQ(a)
      • Refutation
        • P(i);
    • Try
      • P(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(j);CHECK,N_GUARD::S(D),XS(j)
        • Q(a);OGATE,XP(A)::QAR2(I),XQ(a)
      • Refutation
        • P(i);
    • Try
      • P(A);
      • Threat
        • R1(K)
      • Vars
        • Q(a);CHECK,N_GUARD::QAR2(I),XQ(a)
        • S(j);CHECK,N_GUARD::S(D),XS(j)
        • Q(a);N_GUARD::QAB1(I),XQ(a)
      • Refutation
        • P(i);XP(G)
  • Actual
    • P(A);XP(e)
    • Threat
      • DUALS(2)
    • Vars
      • Q(a);CHECK,N_GUARD::QAR2(I),XQ(a)
      • S(j);CHECK,N_GUARD::S(D),XS(j)
      • S(b);XP(A)::S(D),XS(b)
      • Q(a);::S(B)
      • Q(a);N_GUARD::QAB1(I),XQ(a)
      • P(i);::P(A)
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