MESON Chess Problem Database

Problem Display
PID: 7670 (2R5/8/p2p4/p2k4/3P3R/2nNnK1B/7Q/8 w - - 0 1)

Rychkov, Vladimir Nikolaevich

Udartsev, Valentin Filipovich

HM., Shakhmatnaya kompozitsiya, 1992

2R5/8/p2p4/p2k4/3P3R/2nNnK1B/7Q/8

#2

7 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...a4
      • 2.Sb4#
  • Tries
    • 1.Kxe3?
      • threat
        • 2.Sf4#
        • 2.Rh5#
      • 1...Se2
        • 2.Rh5#
        • 2.Qh1#
        • 2.Qg2#
      • 1...Se4
        • 2.Sf4#
        • 2.Qa2#
      • 1...Sd1+!
    • 1.Re4?
      • threat
        • 2.Sf4#
        • 2.Be6#
      • 1...Se2
        • 2.Be6#
      • 1...Sg2
        • 2.Be6#
      • 1...Sg4
        • 2.Sf4#
      • 1...Sf5
        • 2.Sf4#
      • 1...Sxe4!
    • 1.Qg1?
      • threat
        • 2.Qg8#
      • 1...Sg4
        • 2.Sf4#
      • 1...Sg2
        • 2.Rh5#
      • 1...Se4!
    • 1.Qf4?
      • threat
        • 2.Qf7#
      • 1...Se4
        • 2.Qxe4#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sg4!
    • 1.Qa2+?
      • 1...Sc4
        • 2.Qxc4#
      • 1...Sxa2!
    • 1.Qb2?
      • threat
        • 2.Qb7#
      • 1...Sf5
        • 2.Qb3#
      • 1...Se4
        • 2.Sf4#
      • 1...Sb5
        • 2.Sf4#
      • 1...Sg4!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Sf4#
      • 1...Se2
        • 2.Qxa5#
      • 1...Sg2
        • 2.Qg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • P(c);N_GUARD::S(B)
  • Tries
    • Try
      • K(C);P-FLIGHT,XS(b)
      • Threat
        • DUALS(2)
      • Refutation
        • S(a);CHECK
    • Try
      • R(F);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::B(D)
        • S(b);::B(D)
        • S(b);::S(B)
      • Refutation
        • S(a);XR(F)
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • S(b);::S(B)
        • S(b);N_GUARD::R(F)
      • Refutation
        • S(a);
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • S(a);N_GUARD::QAB1(A),XS(a)
        • S(b);N_GUARD::QAR2(A),XS(b)
      • Refutation
        • S(b);
    • Try
      • Q(A);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAB1(A),XS(b)
      • Refutation
        • S(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • S(b);N_GUARD::QAB(A)
        • S(a);::S(B)
      • Refutation
        • S(b);
  • Actual
    • Q(A);
    • Threat
      • S(B)
    • Vars
      • S(a);OGATE::QAR(A),XP(c)
      • S(b);OGATE::QAR(A)
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