MESON Chess Problem Database

Problem Display
PID: 138680 (8/8/rp2B3/n1PRpq2/P1k5/K1N5/1P1pP1nb/5Q2 w - - 0 1)

Lobusov, Andrey Jakovlevic

2nd HM., BCF 119. Ty., 1968-1969

8/8/rp2B3/n1PRpq2/P1k5/K1N5/1P1pP1nb/5Q2

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3
      • 2.exd3#
    • 1...Qh3
      • 2.e3#
    • 1...Qxe6
      • 2.e3#
      • 2.e4#
    • 1...Qg6
      • 2.e4#
    • 1...Qh7
      • 2.e4#
    • 1...Qf3
      • 2.exf3#
    • 1...Qg5
      • 2.e3#
      • 2.e4#
    • 1...Bf4
      • 2.e4#
  • Tries
    • 1.Bd7?
      • threat
        • 2.Bb5#
      • 1...Qxd7
        • 2.e3#
        • 2.e4#
      • 1...b5
        • 2.Bxb5#
      • 1...Sc6!
    • 1.Rxe5+?
      • 1...Qxe6
        • 2.e3#
      • 1...Kd4!
    • 1.e3+?
      • 1...Qd3
        • 2.Rxe5#
        • 2.Qxd3#
      • 1...Qxf1!
  • Keys
    • 1.Sb5!
      • threat
        • 2.Sd6#
      • 1...Qd3+
        • 2.exd3#
      • 1...Qh3+
        • 2.e3#
      • 1...Qf3+
        • 2.exf3#
      • 1...Qxe6
        • 2.e4#
      • 1...bxc5
        • 2.Rd4#
      • 1...Qf8
        • 2.Rxe5#
      • 1...Sb7
        • 2.b3#
      • 1...e4
        • 2.Rxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • Q(g);OGATE,P_PINS(E)::P(C),XQ(g)
    • Q(g);N_GUARD,P_PINS(E)::QAB(A)+P(C)
    • Q(g);N_GUARD::QAB(A)+P(C)
    • Q(g);OGATE,P_PINS(E)::QAB(A)+P(C),XQ(g)
    • B(c);S_CUTQ(g)::QAB(A)+P(C)
  • Tries
    • Try
      • B(I);
      • Threat
        • B(I)
      • Vars
        • P(i);::B(I),XP(i)
      • Refutation
        • S(e);P_PINP(F)
    • Try
      • R(H);CHECK,XP(f)
      • Vars
        • Q(g);XB(I)::QAB(A)+P(C)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • P(C);CHECK
      • Refutation
        • Q(g);XQ(A)
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • Q(g);CHECK,OGATE::P(C),XQ(g)
      • Q(g);CHECK,N_GUARD::QAB(A)+P(C)
      • Q(g);CHECK,OGATE::QAB(A)+P(C),XQ(g)
      • Q(g);N_GUARD,XB(I)::QAB(A)+P(C)
      • P(i);SBLOCK,XP(G)::B(I)+R(H),DCHECK
      • Q(g);N_GUARD,P_PINP(G)::B(I)+R(H),XP(f)
      • S(e);N_GUARD,P_PINP(F)::P(B)
      • P(f);OGATE::B(I)+R(H),XQ(g)
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