MESON Chess Problem Database

Problem Display
PID: 180327 (3R4/b1p5/3q1N2/8/3k2N1/4p3/2Q1P3/3K3B w - - 0 1)

Lider, Valentin Viktorovich

3rd Prize, Problemnoter, 1964

3R4/b1p5/3q1N2/8/3k2N1/4p3/2Q1P3/3K3B

#2

7 + 5

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Rxd5#
    • 1...Qd7
      • 2.Rxd7#
    • 1...Bc5
      • 2.Qd3#
    • 1...c5
      • 2.Rxd6#
      • 2.Qd3#
    • 1...c6
      • 2.Rxd6#
  • Tries
    • 1.Se5?
      • threat
        • 2.Sf3#
        • 2.Sc6#
      • 1...c6
        • 2.Sf3#
        • 2.Sxc6#
      • 1...Kxe5+!
    • 1.Sd5?
      • threat
        • 2.Qc3#
      • 1...Qxd5
        • 2.Rxd5#
      • 1...Qa3
        • 2.Sb4#
      • 1...Qb4
        • 2.Sxb4#
      • 1...Qc5
        • 2.Qd3#
        • 2.Qe4#
      • 1...Qc6!
    • 1.Bd5?
      • threat
        • 2.Qc4#
      • 1...Qxd5
        • 2.Rxd5#
      • 1...Qc5
        • 2.Qd3#
      • 1...Qa6
        • 2.Bc6#
      • 1...Qc6
        • 2.Bxc6#
      • 1...Qb4!
    • 1.Qb3?
      • threat
        • 2.Qb4#
      • 1...Bc5
        • 2.Qd3#
      • 1...c5
        • 2.Rxd6#
        • 2.Qd3#
      • 1...Kc5+!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Qd3#
      • 1...Qxd7
        • 2.Rxd7#
      • 1...Qa3
        • 2.Sc5#
      • 1...Qa6
        • 2.Sb6#
      • 1...Qg6
        • 2.Sdf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(c);OGATE::R1(G),XQ(c)
    • Q(c);OGATEB::R(G),XQ(c)
    • B(d);SBLOCK::QAR1(C)
    • P(e);N_GUARD::R(G),XQ(c)
  • Tries
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Refutation
        • K(b);CHECK,N_SPINQ(c),S_FLIGHT,XS(E)
    • Try
      • S(F);N_PINQ(c)
      • Threat
        • QAB1(C)
      • Vars
        • Q(c);OGATE,P_SPINQ(c),XS(F)::R1(G),XQ(c)
        • Q(c);::R(G)+S(F)
        • Q(c);::R(G)+S(F),XQ(c)
      • Refutation
        • Q(c);
    • Try
      • B(B);N_PINQ(c)
      • Threat
        • QAR1(C)
      • Vars
        • Q(c);OGATE,P_SPINQ(c),XB(B)::R1(G),XQ(c)
        • Q(c);SBLOCK::QAR1(C)
        • Q(c);OGATEB::R(G)+B(B)
        • Q(c);OGATEB::R(G)+B(B),XQ(c)
      • Refutation
        • Q(c);
    • Try
      • Q(C);
      • Threat
        • QAR2(C)
      • Vars
        • B(d);SBLOCK::QAR1(C)
      • Refutation
        • K(b);CHECK,N_SPINQ(c),S_FLIGHT
  • Actual
    • S(F);N_PINQ(c)
    • Threat
      • QAR1(C)
    • Vars
      • Q(c);OGATE,P_SPINQ(c),XS(F)::R(G),XQ(c)
      • Q(c);::R(G)+S(F)
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