MESON Chess Problem Database

Problem Display
PID: 250580 (1R6/r4N2/5Q2/2PP4/1P5R/k1p3r1/p1B3P1/K2N4 w - - 0 1)

Ulanov, Leonid

Schweizerische Schachzeitung, 1997

1R6/r4N2/5Q2/2PP4/1P5R/k1p3r1/p1B3P1/K2N4

#2

11 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg2
      • 2.Qxc3#
    • 1...Rg4
      • 2.Qxc3#
    • 1...Rg5
      • 2.Qxc3#
    • 1...Rg6
      • 2.Qxc3#
    • 1...Rg7
      • 2.Qxc3#
    • 1...Rg8
      • 2.Qxc3#
    • 1...Ra6
      • 2.Qxa6#
    • 1...Rb7
      • 2.Qa6#
    • 1...Rc7
      • 2.Qa6#
    • 1...Rd7
      • 2.Qa6#
    • 1...Re7
      • 2.Qa6#
    • 1...Rxf7
      • 2.Qa6#
    • 1...Ra8
      • 2.Rxa8#
  • Tries
    • 1.Se3?
      • threat
        • 2.Sc4#
        • 2.Qxc3#
      • 1...Rg4
        • 2.Qxc3#
      • 1...Rb7
        • 2.Qxc3#
        • 2.Qa6#
      • 1...Rxe3!
    • 1.Se5?
      • threat
        • 2.Sc4#
      • 1...Rb7
        • 2.Qa6#
      • 1...Rg4!
    • 1.Sd6?
      • threat
        • 2.Sc4#
        • 2.Sb5#
      • 1...Rg4
        • 2.Qxc3#
      • 1...Ra5
        • 2.Sc4#
      • 1...Rb7!
    • 1.Ra8?
      • threat
        • 2.Rxa7#
      • 1...Rg4
        • 2.Qxc3#
      • 1...Ra4
        • 2.Rxa4#
      • 1...Ra5
        • 2.Rxa5#
      • 1...Ra6
        • 2.Rxa6#
        • 2.Qxa6#
      • 1...Rxa8!
  • Keys
    • 1.Sb2!
      • threat
        • 2.Sc4#
      • 1...cxb2+
        • 2.Qxb2#
      • 1...Rg4
        • 2.Qxc3#
      • 1...Rb7
        • 2.Qa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 11
  • Sets
    • R(d);N_GUARD,XP(D)::QAR2(I),XP(c)
    • R(d);N_GUARD::QAR2(I),XP(c)
    • R(e);N_GUARD::QAR(I),XR(e)
    • R(e);N_GUARD::QAR(I)
    • R(e);N_GUARD,XS(J)::QAR(I)
    • R(e);OGATEB::R(K),XR(e)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(d);::QAR2(I),XP(c)
      • Refutation
        • R(d);XS(B)
    • Try
      • S(J);
      • Threat
        • S(J)
      • Vars
        • R(e);N_GUARD::QAR(I)
      • Refutation
        • R(d);
    • Try
      • S(J);
      • Threat
        • DUALS(2)
      • Vars
        • R(d);N_GUARD::QAR2(I),XP(c)
        • R(e);::S(J)
      • Refutation
        • R(e);
    • Try
      • R(K);P_PINR(e)
      • Threat
        • R(K),XR(e)
      • Vars
        • R(d);N_GUARD::QAR2(I),XP(c)
        • R(e);OGATE::R1(K),XR(e)
        • R(e);OGATE::R(K),XR(e)
      • Refutation
        • R(e);N_SPINR(e),XR(K)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • P(c);CHECK,OGATE,XS(B)::QAB1(I),XP(c)
      • R(d);N_GUARD::QAR2(I),XP(c)
      • R(e);N_GUARD::QAR(I)
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