MESON Chess Problem Database

Problem Display
PID: 260961 (B1nK4/2pp1P2/1p1k3p/2NP3r/P7/P1BN4/2QRR2b/2q2r1b w - - 0 1)

Shanshin, Valery Yurevich

4th Prize, Neue Zurcher Zeitung, 2009

B1nK4/2pp1P2/1p1k3p/2NP3r/P7/P1BN4/2QRR2b/2q2r1b

#2

12 + 11

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rf3
      • 2.Se4#
    • 1...Be4
      • 2.Sxe4#
  • Tries
    • 1.Se5?
      • threat
        • 2.Sb7#
      • 1...Kxc5
        • 2.Bb4#
      • 1...Bxd5
        • 2.Rxd5#
      • 1...bxc5
        • 2.Sc4#
      • 1...Qxd2!
    • 1.Bb4?
      • threat
        • 2.Se4#
      • 1...Rxd5
        • 2.Sb7#
      • 1...Bxd5
        • 2.Sb7#
      • 1...bxc5
        • 2.Bxc5#
      • 1...Be4
        • 2.Sxe4#
      • 1...c6!
    • 1.f8Q+?
      • 1...Se7
        • 2.Qxe7#
      • 1...Rxf8+!
    • 1.f8B+?
      • 1...Se7
        • 2.Bxe7#
      • 1...Rxf8+!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Sb7#
      • 1...Kxc5
        • 2.Bb4#
      • 1...Rxd5
        • 2.Be5#
      • 1...Bxd5
        • 2.Se4#
      • 1...bxc5
        • 2.Qg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • R(b);S_CUTB(c)::S(H)
    • B(c);N_GUARD::S(H),XB(c)
  • Tries
    • Try
      • S(F);
      • Threat
        • S(H)
      • Vars
        • K(g);OGATEB,S_FLIGHT,XS(H)::QAR(A)+B(E),DCHECK
        • B(c);OGATE,P_SPINB(c),XP(I)::R1(B),XB(c)
        • P(f);SBLOCK,XS(H)::S(F)
      • Refutation
        • Q(a);XR(B)
    • Try
      • B(E);
      • Threat
        • B(E)+S(H),DCHECK
      • Vars
        • R(e);SBLOCK,XP(I)::B(E)+S(H),DCHECK
        • B(c);SBLOCK,XP(I)::B(E)+S(H),DCHECK
        • P(f);OGATE,P_SPINP(f),XS(H)::B(E),XP(f)
        • B(c);::B(E)+S(H),DCHECK,XB(c)
      • Refutation
        • P(i);
    • Try
      • P(J);CHECK
      • Vars
        • S(k);N_GUARD,P_SPINS(k)::QAB1(J),XS(k)
      • Refutation
        • R(b);CHECK,XQ(J)
    • Try
      • P(J);CHECK
      • Vars
        • S(k);N_GUARD,P_SPINS(k)::B(J),XS(k)
      • Refutation
        • R(b);CHECK,XB(J)
  • Actual
    • S(F);
    • Threat
      • S(H)
    • Vars
      • K(g);OGATEB,S_FLIGHT,XS(H)::QAR(A)+B(E),DCHECK
      • R(e);N_GUARD,P_SPINR(e),XP(I)::B(E)
      • B(c);N_GUARD,P_SPINB(c),XP(I)::S(H)
      • P(f);SBLOCK,XS(H)::QAR(A)
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