MESON Chess Problem Database

Problem Display
PID: 261534 (2br4/3P4/2P1kpP1/1R5P/1QK3N1/8/8/8 w - - 0 1)

Angeli, Herbert

Neue Zurcher Zeitung, 1959

2br4/3P4/2P1kpP1/1R5P/1QK3N1/8/8/8

#2

8 + 4

5454 Near Snap 2022
6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Re8
      • 2.dxe8Q#
      • 2.dxe8R#
    • 1...f5
      • 2.Re5#
  • Tries
    • 1.Rd5?
      • threat
        • 2.Qe1#
        • 2.Qd6#
      • 1...Rxd7
        • 2.Qe1#
      • 1...Ba6+!
    • 1.Qf8?
      • threat
        • 2.Qxf6#
      • 1...f5
        • 2.Re5#
        • 2.Qf6#
      • 1...Rxf8!
    • 1.dxc8Q+?
      • 1...Rd7
        • 2.Qxd7#
      • 1...Rxc8!
    • 1.dxc8B+?
      • 1...Rd7
        • 2.Bxd7#
      • 1...Rxc8!
  • Keys
    • 1.Kc5!
      • threat
        • 2.Qe4#
      • 1...Kf5
        • 2.Kd6#
      • 1...Ke7
        • 2.Kd5#
      • 1...f5
        • 2.Qe1#

Anticipated by 58158(1885)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(d);OGATE::PXR(d)=Q
    • P(b);N_GUARD::R1(D)
  • Tries
    • Try
      • R(D);
      • Threat
        • DUALS(2)
      • Vars
        • R(d);XP(H)::QAR(A)
      • Refutation
        • B(c);CHECK
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XP(b)
      • Refutation
        • R(d);XQ(A)
    • Try
      • P(H);CHECK,XB(c)
      • Vars
        • R(d);N_GUARD,P_SPINR(d)::QAB1(H),XR(d)
      • Refutation
        • R(d);P_PINP(F),XQ(H)
    • Try
      • P(H);CHECK,XB(c)
      • Vars
        • R(d);N_GUARD,P_SPINR(d)::B(H),XR(d)
      • Refutation
        • R(d);P_PINP(F),XB(H)
  • Actual
    • K(B);P-FLIGHT
    • Threat
      • QAR2(A)
    • Vars
      • K(a);S_FLIGHT::R(D)+K(B)
      • K(a);P-FLIGHT::QAB(A)+K(B)
      • P(b);SBLOCK::QAR(A)
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