MESON Chess Problem Database

Problem Display
PID: 135709 (B3Qn2/3p2R1/N1pN2p1/pPPk4/1prn1r2/2pRKp2/8/8 w - - 0 1)

Stojnic, Dragan

The Problemist, 2010

B3Qn2/3p2R1/N1pN2p1/pPPk4/1prn1r2/2pRKp2/8/8

#2

9 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Re4+
      • 2.Qxe4#
    • 1...Rf5
      • 2.Qe4#
    • 1...Rf6
      • 2.Qe4#
    • 1...Rf7
      • 2.Qe4#
  • Tries
    • 1.Kxf4?
      • threat
        • 2.Qe4#
        • 2.Qe5#
      • 1...g5+
        • 2.Rxg5#
      • 1...Rxc5
        • 2.Qe5#
      • 1...Se6+!
    • 1.Se4?
      • threat
        • 2.Sc7#
      • 1...Rxe4+
        • 2.Qxe4#
      • 1...Rxc5
        • 2.Rxd4#
      • 1...Se6!
    • 1.Sf7?
      • threat
        • 2.Qe5#
      • 1...Re4+
        • 2.Qxe4#
      • 1...Rxf7
        • 2.Qe4#
      • 1...Rf5
        • 2.Qe4#
      • 1...Se6
        • 2.Qxd7#
      • 1...d6
        • 2.Bxc6#
      • 1...Rxc5!
  • Keys
    • 1.Rxd7!
      • threat
        • 2.Bxc6#
      • 1...Re4+
        • 2.Qxe4#
      • 1...Rxc5
        • 2.Sc7#
      • 1...Se6
        • 2.Sf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • R(f);CHECK,N_GUARD::QAB1(I),XR(f)
    • R(f);N_GUARD::QAB1(I)
  • Tries
    • Try
      • K(B);S_FLIGHT,XR(f)
      • Threat
        • DUALS(2)
      • Vars
        • P(j);CHECK,OGATE::R(G),XP(j)
        • R(d);XP(D)::QAR1(I)
      • Refutation
        • S(l);CHECK
    • Try
      • S(F);
      • Threat
        • S(E)
      • Vars
        • R(f);CHECK,OGATE,XS(F)::QAB1(I),XR(f)
        • R(d);N_GUARD,XP(D)::R1(A),XS(e)
      • Refutation
        • S(l);
    • Try
      • S(F);
      • Threat
        • QAR1(I)
      • Vars
        • R(f);CHECK,N_GUARD::QAB1(I),XR(f)
        • R(f);N_GUARD,XS(F)::QAB1(I)
        • R(f);N_GUARD::QAB1(I)
        • S(l);N_GUARD::QAR2(I),XP(k)
        • P(k);N_GUARD::B(H),XP(i)
      • Refutation
        • R(d);XP(D)
  • Actual
    • R(G);XP(k)
    • Threat
      • B(H),XP(i)
    • Vars
      • R(f);CHECK,N_GUARD::QAB1(I),XR(f)
      • R(d);SBLOCK,XP(D)::S(E)
      • S(l);N_GUARD::R(G)+S(F)
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