MESON Chess Problem Database

Problem Display
PID: 275758 (1nr1b3/RPkpP3/3R1p2/2r2P2/B2Q1P1K/2N5/8/8 w - - 0 1)

Yarmonov, Igor Petrovich

Buletin Problemistic, 1999

1nr1b3/RPkpP3/3R1p2/2r2P2/B2Q1P1K/2N5/8/8

#2

10 + 7

15601 Albrecht-Leiss-Degener Collection 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc3
      • 2.Qb6#
    • 1...Rc4
      • 2.Sb5#
      • 2.Qb6#
    • 1...Ra5
      • 2.Qb6#
    • 1...Rb5
      • 2.Sxb5#
    • 1...Rd5
      • 2.Qb6#
    • 1...Re5
      • 2.Qb6#
    • 1...Rxf5
      • 2.Qb6#
    • 1...Rc6
      • 2.Sb5#
  • Tries
    • 1.Sd5+?
      • 1...Rxd5
        • 2.Qb6#
      • 1...Kxd6!
    • 1.Rb6?
      • threat
        • 2.Qd6#
      • 1...Kxb6
        • 2.bxc8S#
      • 1...Sc6
        • 2.b8Q#
      • 1...Rd5
        • 2.Sxd5#
      • 1...Rc6
        • 2.Sb5#
      • 1...d6
        • 2.Qxd6#
      • 1...d5!
    • 1.Rxf6?
      • threat
        • 2.Qd6#
      • 1...d6
        • 2.Qxd6#
      • 1...Rd5
        • 2.Sxd5#
        • 2.Qb6#
      • 1...Rc6
        • 2.Sb5#
        • 2.Sd5#
      • 1...d5
        • 2.Qe5#
      • 1...Sc6!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Qb6#
      • 1...Kxd6
        • 2.bxc8S#
      • 1...Sa6
        • 2.b8Q#
        • 2.b8B#
      • 1...Sc6
        • 2.b8Q#
        • 2.b8B#
      • 1...Rb5
        • 2.Sxb5#
      • 1...Rc6
        • 2.Sd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • R(a);OGATE,XS(A)::QAB1(C)
    • R(a);OGATE::QAB1(C)
    • R(a);N_GUARD::S(A),XR(a)
    • R(a);OGATE,XP(F)::QAB1(C)
    • R(a);N_GUARD::S(A)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • R(a);OGATE,XS(A)::QAB1(C)
      • Refutation
        • K(c);S_FLIGHT,XR(G)
    • Try
      • R(G);
      • Threat
        • QAB1(C)
      • Vars
        • K(c);N_GUARD,P_SPINR(a),S_FLIGHT,XR(G)::PXR(f)=S
        • S(e);OGATE::P=Q
        • R(a);N_GUARD::S(A),XR(a)
        • R(a);N_GUARD::S(A)
        • P(d);::QAB1(C),XP(d)
      • Refutation
        • P(d);
    • Try
      • R(G);XP(b)
      • Threat
        • QAB1(C)
      • Vars
        • P(d);::QAB1(C),XP(d)
        • P(d);N_GUARD,S_CUTR(a)::QAB(C)
      • Refutation
        • S(e);
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • K(c);N_GUARD,P_SPINR(a),S_FLIGHT,XR(G)::PXR(f)=S
      • S(e);OGATE::P=Q
      • R(a);N_GUARD::S(A),XR(a)
      • R(a);N_GUARD::S(A)
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