MESON Chess Problem Database

Problem Display
PID: 266431 (Q7/p7/2NKpp1B/3R3B/Rr2k3/3pp3/2n1p2n/2N5 w - - 0 1)

Novitski, Petr Adrinovich

Tkachenko, Sergiy Ivanovich

Die Schwalbe, 2022

Q7/p7/2NKpp1B/3R3B/Rr2k3/3pp3/2n1p2n/2N5

#2

8 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.Rxb4#
    • 1...Se1
      • 2.Rxb4#
    • 1...f5
      • 2.Re5#
  • Tries
    • 1.Rxb4+?
      • 1...Sd4
        • 2.Rbxd4#
      • 1...Sxb4!
    • 1.Rxd3?
      • threat
        • 2.Se7#
      • 1...Rd4+
        • 2.Sxd4#
      • 1...Kf5
        • 2.Se7#
      • 1...Sd4!
    • 1.Rd4+?
      • 1...Kf5
        • 2.Se7#
      • 1...Rxd4+
        • 2.Sxd4#
      • 1...Sxd4!
    • 1.Rf5?
      • threat
        • 2.Rf4#
      • 1...Rd4+
        • 2.Sxd4#
      • 1...Kxf5
        • 2.Se7#
      • 1...exf5
        • 2.Qe8#
      • 1...e5!
  • Keys
    • 1.Se7!
      • threat
        • 2.Rxd3#
      • 1...exd5
        • 2.Qxd5#
      • 1...Rd4
        • 2.Rdxd4#
      • 1...Sd4
        • 2.Re5#
      • 1...d2
        • 2.Rxd2#
        • 2.Rd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • S(a);N_GUARD::R(B),XR(f)
    • P(i);N_GUARD::R1(C)
  • Tries
    • Try
      • R(B);CHECK,XR(f)
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::R1(B),XS(a)
      • Refutation
        • S(a);XR(B)
    • Try
      • R(C);XP(d)
      • Threat
        • QAB(H)+S(E)
      • Vars
        • R(f);CHECK,N_GUARD::QAB(H)+S(E),XR(f)
        • K(g);N_SPINR(f),S_FLIGHT::S(E)
      • Refutation
        • S(a);N_SPINR(f)
    • Try
      • R(C);CHECK,N_PINR(f)
      • Vars
        • K(g);N_GUARD,S_FLIGHT::S(E)
        • R(f);CHECK,P_SPINR(f),XR(C)::QAB(H)+S(E),XR(f)
      • Refutation
        • S(a);XR(C)
    • Try
      • R(C);
      • Threat
        • R1(C)
      • Vars
        • R(f);CHECK,N_GUARD::QAB(H)+S(E),XR(f)
        • K(g);N_GUARD,N_SPINR(f),S_FLIGHT,XR(C)::S(E)
        • P(h);OGATEB,SBLOCK,XR(C)::QAR(H)
      • Refutation
        • P(h);
  • Actual
    • S(E);
    • Threat
      • QAB(H)+R(C),XP(d)
    • Vars
      • P(h);OGATE,P_SPINP(h),XR(C)::QAB1(H),XP(h)
      • R(f);P_PINR(C)::QAB(H)+R(C),DCHECK,XR(f)
      • S(a);N_SPINR(f),SBLOCK::QAB(H)+R(C),DCHECK
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