MESON Chess Problem Database

Problem Display
PID: 36552 (3R1K2/5R1p/8/1pN1k2p/4bp2/8/6N1/q4nQ1 w - - 0 1)

Heinonen, Unto

2nd Prize, Suomen Shakki, 1973

3R1K2/5R1p/8/1pN1k2p/4bp2/8/6N1/q4nQ1

#2

6 + 8

3753 FIDE Album (1971-1973) 1978

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Qxd4#
    • 1...Qb1
      • 2.Qd4#
    • 1...Qc1
      • 2.Qd4#
    • 1...Qe1
      • 2.Qd4#
    • 1...Qa2
      • 2.Qd4#
    • 1...Qa3
      • 2.Qd4#
    • 1...Qa5
      • 2.Qd4#
    • 1...Qa6
      • 2.Qd4#
    • 1...Qa7
      • 2.Qd4#
    • 1...Qa8
      • 2.Qd4#
    • 1...Sd2
      • 2.Qxa1#
    • 1...Sh2
      • 2.Qxa1#
    • 1...Se3
      • 2.Qxa1#
    • 1...Sg3
      • 2.Qxa1#
  • Tries
    • 1.Se1?
      • threat
        • 2.Qg7#
      • 1...Qa6
        • 2.Qd4#
      • 1...Bg2
        • 2.Sed3#
      • 1...Bg6
        • 2.Sf3#
      • 1...Sg3!
    • 1.Se3?
      • threat
        • 2.Qg7#
      • 1...Bg2
        • 2.Rf5#
      • 1...Bg6
        • 2.Rd5#
      • 1...Sg3
        • 2.Qxa1#
      • 1...Qa6!
    • 1.Sxf4?
      • threat
        • 2.Qg7#
      • 1...Qa6
        • 2.Qd4#
      • 1...Bg2
        • 2.Sfd3#
      • 1...Bg6
        • 2.Rd5#
      • 1...Sg3
        • 2.Qxa1#
      • 1...Bf5!
    • 1.Sd3+?
      • 1...Ke6
        • 2.Sgxf4#
      • 1...Bxd3!
  • Keys
    • 1.Sh4!
      • threat
        • 2.Qg7#
      • 1...Qa6
        • 2.Qd4#
      • 1...Bg2
        • 2.Rf5#
      • 1...Bg6
        • 2.Sf3#
      • 1...Sg3
        • 2.Qxa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 12
  • Sets
    • Q(a);N_GUARD::QAB1(A),XQ(a)
    • Q(a);N_GUARD::QAB1(A)
    • Q(a);N_GUARD,P_PINS(C)::QAB1(A)
    • Q(a);N_GUARD,P_PINR(E)::QAB1(A)
    • S(b);OGATE::QAB(A),XQ(a)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAB(A)
      • Vars
        • Q(a);N_GUARD::QAB1(A)
        • B(c);N_GUARD::S(B)
      • Refutation
        • S(b);
    • Try
      • S(B);
      • Threat
        • QAB(A)
      • Vars
        • B(c);N_GUARD::R1(D)
        • B(c);N_GUARD::R1(E)
        • S(b);OGATE::QAB(A),XQ(a)
      • Refutation
        • Q(a);
    • Try
      • S(B);XP(d)
      • Threat
        • QAB(A)
      • Vars
        • Q(a);N_GUARD::QAB1(A)
        • B(c);N_GUARD::S(B)
        • B(c);N_GUARD::R1(E)
        • S(b);OGATE::QAB(A),XQ(a)
      • Refutation
        • B(c);
    • Try
      • S(C);CHECK
      • Vars
        • K(f);P-FLIGHT::S(B),XP(d)
      • Refutation
        • B(c);XS(C)
  • Actual
    • S(B);
    • Threat
      • QAB(A)
    • Vars
      • Q(a);N_GUARD::QAB1(A)
      • B(c);N_GUARD::R1(D)
      • B(c);N_GUARD::S(B)
      • S(b);OGATE::QAB(A),XQ(a)
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