MESON Chess Problem Database

Problem Display
PID: 272354 (3n4/3p4/R2q2Qp/4k3/2R2p2/2prrP2/6PK/BB6 w - - 0 1)

Back, Par-Erik

Schackvarlden, 1938

3n4/3p4/R2q2Qp/4k3/2R2p2/2prrP2/6PK/BB6

#2

8 + 9

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Qa3
      • 2.Qh5#
    • 1...Qb4
      • 2.Qh5#
    • 1...Qc5
      • 2.Qh5#
    • 1...Qc7
      • 2.Qh5#
    • 1...Qb8
      • 2.Qh5#
    • 1...Qd4
      • 2.Qh5#
    • 1...Qd5
      • 2.Qh5#
      • 2.Qf6#
    • 1...Rd1
      • 2.Qf5#
    • 1...Rd2
      • 2.Qf5#
    • 1...Rd4
      • 2.Qf5#
    • 1...Rd5
      • 2.Qf5#
  • Tries
    • 1.Bxc3+?
      • 1...Qd4
        • 2.Qh5#
      • 1...Rxc3
        • 2.Qf5#
        • 2.Qxd6#
      • 1...Rd4
        • 2.Qf5#
        • 2.Qxd6#
      • 1...Kd5!
    • 1.Re4+?
      • 1...Kd5
        • 2.Qxd6#
      • 1...Rxe4!
    • 1.Rxd6?
      • threat
        • 2.Qf6#
      • 1...Rxd6
        • 2.Qf5#
      • 1...Se6!
    • 1.Qxd6+?
      • 1...Kf5
        • 2.Qxf4#
        • 2.Qf6#
      • 1...Rxd6!
  • Keys
    • 1.Rxc3!
      • threat
        • 2.Rc5#
      • 1...Kd4
        • 2.Qxd6#
      • 1...Kd5
        • 2.Qxd6#
      • 1...Rxc3
        • 2.Qxd6#
      • 1...Qc5
        • 2.Rxc5#
      • 1...Qd4
        • 2.Qh5#
      • 1...Qd5
        • 2.Qf6#
      • 1...Rd4
        • 2.Qf5#
      • 1...Rd5
        • 2.Rxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • Q(f);::QAR(H)
    • Q(f);N_SPINP(a)::QAR(H)
    • R(b);::QAR1(H)
    • R(b);P_PINP(C)::QAR1(H)
    • R(b);N_SPINP(a)::QAR1(H)
    • R(b);SBLOCK::QAR1(H)
  • Tries
    • Try
      • B(A);CHECK,XP(a)
      • Vars
        • Q(f);P_SPINQ(f)::QAR(H)
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • R(F);CHECK
      • Vars
        • K(e);N_GUARD,N_SPINP(a),P-FLIGHT::QAR1(H),XQ(f)
      • Refutation
        • R(c);XR(F)
    • Try
      • R(G);XQ(f)
      • Threat
        • QAB1(H)
      • Vars
        • R(b);SBLOCK,XR(G)::QAR1(H)
      • Refutation
        • S(i);
    • Try
      • Q(H);CHECK,XQ(f)
      • Refutation
        • R(b);XQ(H)
  • Actual
    • R(F);XP(a)
    • Threat
      • B(A)+R(F),DCHECK
    • Vars
      • K(e);N_GUARD,S_CUTR(b),S_FLIGHT::QAR2(H),XQ(f)
      • K(e);N_GUARD,P-FLIGHT,S_CUTR(b)::QAR1(H),XQ(f)
      • R(b);N_GUARD,P_SPINR(b),XR(F)::QAB1(H),XQ(f)
      • Q(f);::B(A)+R(F),DCHECK,XQ(f)
      • Q(f);SBLOCK::QAR(H)
      • Q(f);N_GUARD,SBLOCK::QAB1(H)
      • R(b);SBLOCK::QAR1(H)
      • R(b);OGATE,SBLOCK::B(A)+R(F),DCHECK,XR(c)
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