MESON Chess Problem Database

Problem Display
PID: 185118 (b7/1P5B/4p3/2R1p3/p4pN1/B1P2Q2/1nPkP1K1/R7 w - - 0 1)

Valtonen, Kari

3rd Prize, Suomen Shakki, 1981

b7/1P5B/4p3/2R1p3/p4pN1/B1P2Q2/1nPkP1K1/R7

#2

11 + 7

117 Suomen Shakki 1983

SOLUTION

  • SOUND
  • Sets
    • 1...Sd3
      • 2.Qxd3#
    • 1...Sc4
      • 2.Qd3#
  • Tries
    • 1.Rd5+?
      • 1...Sd3
        • 2.Qxd3#
      • 1...exd5!
    • 1.Qxf4+?
      • 1...Kxe2
        • 2.Rxe5#
        • 2.Qe3#
        • 2.Qf2#
      • 1...exf4!
    • 1.e4?
      • threat
        • 2.Qf2#
      • 1...fxe4 ep
        • 2.Qxe3#
      • 1...Sd1
        • 2.Qxd1#
      • 1...Sd3
        • 2.Qd1#
        • 2.Qxd3#
      • 1...Sc4
        • 2.Qd3#
      • 1...Kxc2!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Qe1#
        • 2.e3#
        • 2.e4#
      • 1...Bxb7+
        • 2.e4#
      • 1...f3+
        • 2.exf3#
      • 1...Sd3
        • 2.exd3#
      • 1...Sc4
        • 2.Qe1#
      • 1...e4
        • 2.e3#
      • 1...Sd1
        • 2.Bc1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR1(G),XS(a)
    • S(a);N_GUARD::QAR1(G)
  • Tries
    • Try
      • R(I);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR1(G),XS(a)
      • Refutation
        • P(f);XR(I)
    • Try
      • Q(G);CHECK,P_SPINP(J),XP(d)
      • Refutation
        • P(e);XQ(G)
    • Try
      • P(C);
      • Threat
        • QAR2(G)
      • Vars
        • P(d);EP,N_GUARD,XP(C)::QAB1(G),XP(d)
        • S(a);N_GUARD::QAR1(G),XS(a)
        • S(a);N_GUARD::QAR1(G)
      • Refutation
        • K(b);P-FLIGHT,XP(B)
  • Actual
    • Q(G);P_SPINP(J)
    • Threat
      • DUALS(3)
    • Vars
      • B(g);CHECK,XP(J)::QAR(G)+P(C)
      • P(d);CHECK,N_PINP(J),OGATE::QAR(G)+P(C),XP(d)
      • S(a);OGATE::QAR(G)+P(C),XS(a)
      • S(a);::QAB1(G)
      • P(e);N_PINP(J)::QAR(G)+P(C)
      • S(a);OGATE,SBLOCK::B(E)
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