MESON Chess Problem Database

Problem Display
PID: 177892 (3R2N1/1b5r/1K1Bk1B1/5pn1/7b/2NPp1p1/1Q6/n4r2 w - - 0 1)

Leun, Evgeny

Sp. Prize, Sahs (Latvia), 1984

3R2N1/1b5r/1K1Bk1B1/5pn1/7b/2NPp1p1/1Q6/n4r2

#2

8 + 10

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Se2?
      • threat
        • 2.Qe5#
      • 1...Kd5
        • 2.Qe5#
      • 1...Sf3
        • 2.Sf4#
      • 1...Rb1
        • 2.Sf4#
      • 1...Sf7!
    • 1.Sb5?
      • threat
        • 2.Qe5#
      • 1...Kd5
        • 2.Qe5#
      • 1...Sf7
        • 2.Sc7#
      • 1...Sf3!
    • 1.Qa2+?
      • 1...Bd5
        • 2.Qxd5#
      • 1...Sb3!
    • 1.Qb3+?
      • 1...Bd5
        • 2.Qxd5#
      • 1...Sxb3!
    • 1.Qb5?
      • threat
        • 2.Qe5#
      • 1...Sf3
        • 2.Qxf5#
      • 1...Bd5
        • 2.Qxd5#
      • 1...Sf7
        • 2.Qd7#
      • 1...Rb1!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Qe5#
      • 1...Kxd5
        • 2.Qe5#
      • 1...Sf3
        • 2.Sf4#
      • 1...Rb1
        • 2.Sf4#
      • 1...Sf7
        • 2.Sc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);
      • Threat
        • QAR1(A)
      • Vars
        • K(h);S_FLIGHT::QAR1(A)
        • S(g);S_CUTR(b)::S(B)
        • R(b);N_GUARD,P_PINQ(A)::S(B)
      • Refutation
        • S(g);
    • Try
      • S(B);
      • Threat
        • QAR1(A)
      • Vars
        • K(h);S_FLIGHT::QAR1(A)
        • S(g);S_CUTR(j)::S(B)
      • Refutation
        • S(g);
    • Try
      • Q(A);CHECK
      • Vars
        • B(i);N_GUARD,P_SPINB(i)::QAB1(A),XB(i)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(A);CHECK
      • Vars
        • B(i);N_GUARD,P_SPINB(i)::QAB1(A),XB(i)
      • Refutation
        • S(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • S(g);S_CUTR(b)::QAB1(A),XP(f)
        • B(i);N_GUARD::QAB1(A),XB(i)
        • S(g);S_CUTR(j)::QAB1(A)
      • Refutation
        • R(b);P_PINQ(A)
  • Actual
    • S(B);
    • Threat
      • QAR1(A)
    • Vars
      • K(h);S_FLIGHT,XS(B)::QAR1(A)
      • S(g);S_CUTR(b)::S(B)
      • R(b);N_GUARD,P_PINQ(A)::S(B)
      • S(g);S_CUTR(j)::S(B)
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