MESON Chess Problem Database

Problem Display
PID: 180351 (8/Q1p4K/1qP3B1/7R/3k4/2R5/2nB4/8 w - - 0 1)

Lider, Valentin Viktorovich

2nd HM., Shakhmaty v SSSR, 1972

8/Q1p4K/1qP3B1/7R/3k4/2R5/2nB4/8

#2

7 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qc5
      • 2.Qxc5#
  • Tries
    • 1.Bxc2?
      • 1...Qc5
        • 2.Qxc5#
      • 1...Qxa7!
    • 1.Rxc2?
      • 1...Qc5
        • 2.Qxc5#
      • 1...Qxa7!
    • 1.Rhc5?
      • threat
        • 2.R3c4#
      • 1...Qxc5
        • 2.Qxc5#
      • 1...Qb3
        • 2.Rb5#
      • 1...Qb4
        • 2.Rd3#
      • 1...Qb5
        • 2.Rxb5#
      • 1...Sa3
        • 2.Be3#
      • 1...Se3
        • 2.Bxe3#
      • 1...Qa6!
  • Keys
    • 1.Rcc5!
      • threat
        • 2.Rhd5#
      • 1...Qxc5
        • 2.Qxc5#
      • 1...Qxc6
        • 2.Rxc6#
      • 1...Qb3
        • 2.Rh4#
      • 1...Se3
        • 2.Bc3#
      • 1...Sb4
        • 2.Qa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(c);OGATE::QAB1(F),XQ(c)
  • Tries
    • Try
      • B(E);XS(a)
      • Vars
        • Q(c);OGATE::QAB1(F),XQ(c)
      • Refutation
        • Q(c);N_SPINQ(c),XQ(F)
    • Try
      • R(B);XS(a)
      • Vars
        • Q(c);OGATE::QAB1(F),XQ(c)
      • Refutation
        • Q(c);N_SPINQ(c),XQ(F)
    • Try
      • R(C);N_PINQ(c)
      • Threat
        • R1(B)
      • Vars
        • Q(c);OGATE,P_SPINQ(c),XR(C)::QAB1(F),XQ(c)
        • Q(c);OGATEB::QAB(F)+R(C)
        • Q(c);::R1(B)
        • Q(c);OGATEB::QAB(F)+R(C),XQ(c)
        • S(a);N_GUARD::B(A)
        • S(a);N_GUARD::B(A),XS(a)
      • Refutation
        • Q(c);
  • Actual
    • R(B);N_PINQ(c)
    • Threat
      • R1(C)
    • Vars
      • Q(c);OGATE,P_SPINQ(c),XR(B)::QAB1(F),XQ(c)
      • Q(c);OGATE,XP(D)::QAB(F)+R(B),XQ(c)
      • Q(c);::R(C)
      • S(a);SBLOCK::B(A)
      • S(a);N_GUARD,S_CUTQ(c)::QAB(F)
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