MESON Chess Problem Database

Problem Display
PID: 249955 (K3Q3/4N2p/p1p5/2P1b3/q3k3/3R1R2/4P1n1/7n w - - 0 1)

Paalanen, Erkki

Stella Polaris, 1969

K3Q3/4N2p/p1p5/2P1b3/q3k3/3R1R2/4P1n1/7n

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1
      • 2.Qxc6#
    • 1...Qc2
      • 2.Qxc6#
    • 1...Qa1
      • 2.Qxc6#
    • 1...Qa3
      • 2.Qxc6#
    • 1...Qb4
      • 2.Qxc6#
    • 1...Qa5
      • 2.Qxc6#
    • 1...Sf4
      • 2.Rfe3#
    • 1...h5
      • 2.Qg6#
    • 1...h6
      • 2.Qg6#
  • Tries
    • 1.Sd5?
      • threat
        • 2.Sc3#
        • 2.Sf6#
      • 1...Qd4
        • 2.Sf6#
      • 1...Sf4
        • 2.Rxf4#
      • 1...Qc2
        • 2.Sf6#
      • 1...Qb3
        • 2.Sf6#
      • 1...Qa1
        • 2.Sf6#
      • 1...Qa3
        • 2.Sf6#
      • 1...Qb4
        • 2.Sf6#
      • 1...Qc4
        • 2.Sf6#
      • 1...Qa5
        • 2.Sf6#
      • 1...cxd5!
    • 1.Sxc6?
      • threat
        • 2.Qxe5#
      • 1...Qxc6+
        • 2.Qxc6#
      • 1...Qd4
        • 2.Rxd4#
      • 1...Qa1!
    • 1.Sg6?
      • threat
        • 2.Qxe5#
      • 1...hxg6
        • 2.Qxg6#
      • 1...Qa1
        • 2.Qxc6#
      • 1...Qd4!
    • 1.Qd7?
      • threat
        • 2.Qf5#
      • 1...Se3
        • 2.Rdxe3#
      • 1...Sh4
        • 2.Rde3#
      • 1...Sg3!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Sd6#
      • 1...Qd4
        • 2.Rxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • Q(c);N_GUARD::QAB(G),XP(g)
    • S(b);N_GUARD,SBLOCK::R1(C)
    • P(h);N_GUARD::QAB(G)
  • Tries
    • Try
      • S(E);P_PINB(e)
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);::S(E)
        • S(b);N_GUARD::R1(C),XS(b)
      • Refutation
        • P(g);XS(E)
    • Try
      • S(E);P_PINB(e),XP(g)
      • Threat
        • QAR1(G),XB(e)
      • Vars
        • Q(c);CHECK,OGATE,XS(E)::QAB(G),XQ(c)
        • Q(c);N_GUARD::R1(B),XQ(c)
      • Refutation
        • Q(c);
    • Try
      • S(E);P_PINB(e)
      • Threat
        • QAR1(G),XB(e)
      • Vars
        • P(h);OGATE,XS(E)::QAB(G),XP(h)
        • Q(c);N_GUARD::QAB(G),XP(g)
      • Refutation
        • Q(c);
    • Try
      • Q(G);
      • Threat
        • QAB1(G)
      • Vars
        • S(b);N_GUARD::R1(B),XS(b)
        • S(b);N_GUARD::R1(B)
      • Refutation
        • S(a);
  • Actual
    • S(E);P_PINB(e)
    • Threat
      • S(E)
    • Vars
      • Q(c);N_GUARD::R1(B),XQ(c)
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